diff --git a/extensions/fablabchemnitz/contour_scanner_and_trimmer/contour_scanner_and_trimmer.inx b/extensions/fablabchemnitz/contour_scanner_and_trimmer/contour_scanner_and_trimmer.inx
index 42c5975e..8e1a77f7 100644
--- a/extensions/fablabchemnitz/contour_scanner_and_trimmer/contour_scanner_and_trimmer.inx
+++ b/extensions/fablabchemnitz/contour_scanner_and_trimmer/contour_scanner_and_trimmer.inx
@@ -10,7 +10,7 @@
                     <param name="show_debug" type="bool" gui-text="Show debug infos">false</param>
                     <param name="break_apart" type="bool" gui-text="Break apart input" gui-description="Break apart input paths into sub paths. Modifies original paths: converts to absolute paths and might create additional new path elements.">false</param>   
                     <param name="handle_groups" type="bool" gui-text="Handle groups" gui-description="Also looks for paths in groups which are in the current selection. Note: The generated results have a different structure (less granularity due to grouping and conversion of absolute paths to relative paths) than directly selected paths. The colorization for non-intersected paths will be different too.">false</param> 
-                    <param name="flattenbezier" type="bool" gui-text="Quantization (flatten bezier curves to polylines)" gui-description="Convert bezier curves to polylines.">true</param>  
+                    <param name="flattenbezier" type="bool" gui-text="Quantization (flatten bezier curves to (poly)lines)" gui-description="Convert bezier curves to (poly)lines.">true</param>  
                     <param name="flatness" type="float" min="0.001" max="99999.000" precision="3" gui-text="Flatness (tolerance)" gui-description="Minimum flatness = 0.001. The smaller the value the more fine segments you will get (quantization). Large values might destroy the line continuity (default: 0.1).">0.100</param>
                     <param name="decimals" type="int" min="0" max="16" gui-text="Decimals" gui-description="Accuracy for sub split lines / lines trimmed by shapely (default: 3)">3</param>
                     <param name="snap_tolerance" type="float" min="0.01" max="10.0" gui-text="Snap tolerance" gui-description="Snap tolerance for intersection points on paths (default: 0.1)">0.1</param>
@@ -34,9 +34,9 @@
                     <param name="remove_relative" type="bool" gui-text="relative cmd">false</param>
                     <param name="remove_absolute" type="bool" gui-text="absolute cmd">false</param>     
                     <param name="remove_rel_abs_mixed" type="bool" gui-text="mixed rel/abs cmd" gui-description="combined relative and absolute">false</param>
-                    <param name="remove_polylines" type="bool" gui-text="polylines">false</param>
+                    <param name="remove_polylines" type="bool" gui-text="(poly)lines">false</param>
                     <param name="remove_beziers" type="bool" gui-text="beziers">false</param>
-                    <param name="remove_poly_bez_mixed" type="bool" gui-text="mixed cmd polyline/bezier paths" gui-description="combined polyline and bezier">false</param>               
+                    <param name="remove_poly_bez_mixed" type="bool" gui-text="mixed cmd (poly)line/bezier paths" gui-description="combined (poly)line and bezier">false</param>               
                     <param name="remove_opened" type="bool" gui-text="opened">false</param>
                     <param name="remove_closed" type="bool" gui-text="closed">false</param>
                     <param name="remove_self_intersecting" type="bool" gui-text="self-intersecting">false</param>
@@ -47,21 +47,21 @@
                         <option value="separate_group">put to separate group</option>
                     </param>
                     <label appearance="header">Applying to original paths only</label>
-                    <param name="keep_original_after_split_trim" type="bool" gui-text="Keep original paths after sub splitting / trimming">false</param>
+                    <param name="delete_original_after_split_trim" type="bool" gui-text="Delete original paths after sub splitting / trimming">false</param>
                 </page>
                 <page name="tab_highlighting" gui-text="Highlighting">
                     <label appearance="header">Applying to original paths and sub split lines</label>
                     <param name="highlight_relative" type="bool" gui-text="relative cmd">false</param>
                     <param name="highlight_absolute" type="bool" gui-text="absolute cmd">false</param>
                     <param name="highlight_rel_abs_mixed" type="bool" gui-text="mixed rel/abs cmd" gui-description="combined relative and absolute">false</param>  
-                    <param name="highlight_polylines" type="bool" gui-text="polylines">false</param>
+                    <param name="highlight_polylines" type="bool" gui-text="(poly)lines">false</param>
                     <param name="highlight_beziers" type="bool" gui-text="beziers">false</param>
-                    <param name="highlight_poly_bez_mixed" type="bool" gui-text="mixed cmd polyline/bezier paths" gui-description="combined polyline and bezier">false</param>
+                    <param name="highlight_poly_bez_mixed" type="bool" gui-text="mixed cmd (poly)line/bezier paths" gui-description="combined (poly)line and bezier">false</param>
                     <param name="highlight_opened" type="bool" gui-text="opened">false</param>
                     <param name="highlight_closed" type="bool" gui-text="closed">false</param>
                     <param name="highlight_self_intersecting" type="bool" gui-text="self-intersecting" gui-description="Requires enabled 'Draw sub split lines' option (will auto-enable). Will override other highlighting colors (if those options are enabled)">false</param>
                     <label appearance="header">Applying to sub split lines only</label>
-                    <param name="draw_subsplit" type="bool" gui-text="Draw sub split lines" gui-description="Draws polylines which are generated from all input paths">false</param> 
+                    <param name="draw_subsplit" type="bool" gui-text="Draw sub split lines" gui-description="Draws (poly)lines which are generated from all input paths">false</param> 
                     <param name="highlight_duplicates" type="bool" gui-text="duplicates">false</param>
                     <param name="highlight_merges" type="bool" gui-text="merges" gui-description="Requires enabled 'Remove collinear overlapping lines' option (will auto-enable)">false</param>
                     <label appearance="header">Intersection points</label>
@@ -101,9 +101,9 @@
                             <param name="color_relative" type="color" appearance="colorbutton" gui-text="relative cmd paths">3419879935</param>
                             <param name="color_absolute" type="color" appearance="colorbutton" gui-text="absolute cmd paths">1592519679</param>
                             <param name="color_rel_abs_mixed" type="color" appearance="colorbutton" gui-text="mixed cmd rel/abs paths" gui-description="combined relative and absolute">3351636735</param>
-                            <param name="color_polyline" type="color" appearance="colorbutton" gui-text="polyline paths">4289703935</param>
+                            <param name="color_polyline" type="color" appearance="colorbutton" gui-text="(poly)line paths">4289703935</param>
                             <param name="color_bezier" type="color" appearance="colorbutton" gui-text="bezier paths">258744063</param>
-                            <param name="color_poly_bez_mixed" type="color" appearance="colorbutton" gui-text="mixed polyline/bezier paths" gui-description="combined polyline and bezier">4118348031</param>
+                            <param name="color_poly_bez_mixed" type="color" appearance="colorbutton" gui-text="mixed (poly)line/bezier paths" gui-description="combined (poly)line and bezier">4118348031</param>
                             <param name="color_opened" type="color" appearance="colorbutton" gui-text="opened paths">4012452351</param>
                             <param name="color_closed" type="color" appearance="colorbutton" gui-text="closed paths">2330080511</param>
                         </vbox>
diff --git a/extensions/fablabchemnitz/contour_scanner_and_trimmer/contour_scanner_and_trimmer.py b/extensions/fablabchemnitz/contour_scanner_and_trimmer/contour_scanner_and_trimmer.py
index a0f4273d..bad36185 100644
--- a/extensions/fablabchemnitz/contour_scanner_and_trimmer/contour_scanner_and_trimmer.py
+++ b/extensions/fablabchemnitz/contour_scanner_and_trimmer/contour_scanner_and_trimmer.py
@@ -725,7 +725,7 @@ class ContourScannerAndTrimmer(inkex.EffectExtension):
         pars.add_argument("--break_apart", type=inkex.Boolean, default=False, help="Break apart input paths into sub paths")
         pars.add_argument("--handle_groups", type=inkex.Boolean, default=False, help="Also looks for paths in groups which are in the current selection")
         pars.add_argument("--trimming_path_types", default="closed_paths", help="Process open paths by other open paths, closed paths by other closed paths, or all paths by all other paths")
-        pars.add_argument("--flattenbezier", type=inkex.Boolean, default=True, help="Flatten bezier curves to polylines")
+        pars.add_argument("--flattenbezier", type=inkex.Boolean, default=True, help="Flatten bezier curves to (poly)lines")
         pars.add_argument("--flatness", type=float, default=0.1, help="Minimum flatness = 0.001. The smaller the value the more fine segments you will get (quantization). Large values might destroy the line continuity.")
         pars.add_argument("--decimals", type=int, default=3, help="Accuracy for sub split lines / lines trimmed by shapely")
         pars.add_argument("--snap_tolerance", type=float, default=0.1, help="Snap tolerance for intersection points")
@@ -742,9 +742,9 @@ class ContourScannerAndTrimmer(inkex.EffectExtension):
         pars.add_argument("--remove_relative", type=inkex.Boolean, default=False, help="relative cmd")
         pars.add_argument("--remove_absolute", type=inkex.Boolean, default=False, help="absolute cmd")
         pars.add_argument("--remove_rel_abs_mixed", type=inkex.Boolean, default=False, help="mixed rel/abs cmd (relative + absolute)")
-        pars.add_argument("--remove_polylines", type=inkex.Boolean, default=False, help="polyline")
+        pars.add_argument("--remove_polylines", type=inkex.Boolean, default=False, help="(poly)line")
         pars.add_argument("--remove_beziers", type=inkex.Boolean, default=False, help="bezier")
-        pars.add_argument("--remove_poly_bez_mixed", type=inkex.Boolean, default=False, help="mixed polyline/bezier paths")     
+        pars.add_argument("--remove_poly_bez_mixed", type=inkex.Boolean, default=False, help="mixed (poly)line/bezier paths")     
         pars.add_argument("--remove_opened", type=inkex.Boolean, default=False, help="opened")
         pars.add_argument("--remove_closed", type=inkex.Boolean, default=False, help="closed")
         pars.add_argument("--remove_self_intersecting", type=inkex.Boolean, default=False, help="self-intersecting")
@@ -752,19 +752,19 @@ class ContourScannerAndTrimmer(inkex.EffectExtension):
         pars.add_argument("--filter_subsplit_collinear", type=inkex.Boolean, default=True, help="Removes any duplicates by merging (multiple) overlapping line segments into longer lines. Not possible to apply for original paths because this routine does not support bezier type paths.")
         pars.add_argument("--filter_subsplit_collinear_action", default="remove", help="What to do with collinear overlapping lines?")
         #Removing - Applying to original paths only
-        pars.add_argument("--keep_original_after_split_trim", type=inkex.Boolean, default=False, help="Keep original paths after sub splitting / trimming") 
+        pars.add_argument("--delete_original_after_split_trim", type=inkex.Boolean, default=False, help="Delete original paths after sub splitting / trimming") 
 
         #Highlighting - Applying to original paths and sub split lines
         pars.add_argument("--highlight_relative", type=inkex.Boolean, default=False, help="relative cmd paths")
         pars.add_argument("--highlight_absolute", type=inkex.Boolean, default=False, help="absolute cmd paths")
         pars.add_argument("--highlight_rel_abs_mixed", type=inkex.Boolean, default=False, help="mixed rel/abs cmd (relative + absolute) paths")
-        pars.add_argument("--highlight_polylines", type=inkex.Boolean, default=False, help="polyline paths")
+        pars.add_argument("--highlight_polylines", type=inkex.Boolean, default=False, help="(poly)line paths")
         pars.add_argument("--highlight_beziers", type=inkex.Boolean, default=False, help="bezier paths")
-        pars.add_argument("--highlight_poly_bez_mixed", type=inkex.Boolean, default=False, help="mixed polyline/bezier paths")     
+        pars.add_argument("--highlight_poly_bez_mixed", type=inkex.Boolean, default=False, help="mixed (poly)line/bezier paths")     
         pars.add_argument("--highlight_opened", type=inkex.Boolean, default=False, help="opened paths")
         pars.add_argument("--highlight_closed", type=inkex.Boolean, default=False, help="closed paths")
         #Highlighting - Applying to sub split lines only
-        pars.add_argument("--draw_subsplit", type=inkex.Boolean, default=False, help="Draw sub split lines (polylines)")
+        pars.add_argument("--draw_subsplit", type=inkex.Boolean, default=False, help="Draw sub split lines ((poly)lines)")
         pars.add_argument("--highlight_duplicates", type=inkex.Boolean, default=False, help="duplicates (only applies to sub split lines)")
         pars.add_argument("--highlight_merges", type=inkex.Boolean, default=False, help="merges (only applies to sub split lines)")
         #Highlighting - Intersection points
@@ -792,9 +792,9 @@ class ContourScannerAndTrimmer(inkex.EffectExtension):
         pars.add_argument("--color_relative", type=Color, default='3419879935', help="relative cmd paths")
         pars.add_argument("--color_absolute", type=Color, default='1592519679', help="absolute cmd paths")
         pars.add_argument("--color_rel_abs_mixed", type=Color, default='3351636735', help="mixed rel/abs cmd (relative + absolute) paths")     
-        pars.add_argument("--color_polyline", type=Color, default='4289703935', help="polyline paths")
+        pars.add_argument("--color_polyline", type=Color, default='4289703935', help="(poly)line paths")
         pars.add_argument("--color_bezier", type=Color, default='258744063', help="bezier paths")
-        pars.add_argument("--color_poly_bez_mixed", type=Color, default='4118348031', help="mixed polyline/bezier paths")     
+        pars.add_argument("--color_poly_bez_mixed", type=Color, default='4118348031', help="mixed (poly)line/bezier paths")     
         pars.add_argument("--color_opened", type=Color, default='4012452351', help="opened paths")
         pars.add_argument("--color_closed", type=Color, default='2330080511', help="closed paths")
         #Colors - duplicates and merges
@@ -881,7 +881,7 @@ class ContourScannerAndTrimmer(inkex.EffectExtension):
                 continue #skip this loop iteration
 
             '''
-            check for bezier or polyline paths
+            check for bezier or (poly)line paths
             '''
             isPoly = False         
             isBezier = False
@@ -957,9 +957,9 @@ class ContourScannerAndTrimmer(inkex.EffectExtension):
                     segs = list(subPathData.to_segments())
                 #segs = segs[::-1] #reverse the segments
                 
-                #build polylines from segment data
+                #build (poly)lines from segment data
                 subSplitLines = []
-                for i in range(len(segs) - 1): #we could do the same routine to build up polylines using "for x, y in node.path.end_points". See "number nodes" extension
+                for i in range(len(segs) - 1): #we could do the same routine to build up (poly)lines using "for x, y in node.path.end_points". See "number nodes" extension
                     x1, y1, x2, y2 = self.line_from_segments(segs, i, so.decimals)
                     #self.msg("(y1 = {},y2 = {},x1 = {},x2 = {})".format(x1, y1, x2, y2))
                     subSplitId = "{}-{}-{}".format(idPrefixSubSplit, originalPathId, i)
@@ -1267,7 +1267,7 @@ You can try to fix this by:\n\
                 return
 
         #clean original paths if selected.
-        if so.keep_original_after_split_trim is False:
+        if so.delete_original_after_split_trim is True:
             if so.show_debug is True: self.msg("cleaning original paths after sub splitting / trimming")
             for pathElement in pathElements:
                 pathElement.delete()