UI: Tweak labels, descriptions, and panel layout for line art

Changes include:
 - Use `IFACE_` for UI labels set in the modifier panels
 - Use a sub-sub-panel for transparency
 - Fix grammar and spelling mistakes
 - Use more natural user-friendly wording
 - Make descriptions more specific and more useful
 - Don't capitalize "line art" in descriptions (tooltips)

These changes are aimed at making the UI strings more consistent with
the rest of the UI and being more helpful to someone trying to understand
how to use the modifier.

Differential Revision: https://developer.blender.org/D10750

1 files changed, 9 insertions, 5 deletions

diff --git a/source/blender/makesrna/intern/rna_collection.c b/source/blender/makesrna/intern/rna_collection.c
index 90e969560b7..643503e52fa 100644
--- a/source/blender/makesrna/intern/rna_collection.c
+++ b/source/blender/makesrna/intern/rna_collection.c
@@ -520,28 +520,32 @@ void RNA_def_collections(BlenderRNA *brna)
   RNA_def_property_update(prop, NC_SCENE | ND_LAYER_CONTENT, "rna_Collection_flag_update");
 
   static const EnumPropertyItem rna_collection_lineart_usage[] = {
-      {COLLECTION_LRT_INCLUDE, "INCLUDE", 0, "Include", "Collection will produce feature lines"},
+      {COLLECTION_LRT_INCLUDE,
+       "INCLUDE",
+       0,
+       "Include",
+       "Generate feature lines for this collection"},
       {COLLECTION_LRT_OCCLUSION_ONLY,
        "OCCLUSION_ONLY",
        0,
        "Occlusion Only",
        "Only use the collection to produce occlusion"},
-      {COLLECTION_LRT_EXCLUDE, "EXCLUDE", 0, "Exclude", "Don't use this collection in LRT"},
+      {COLLECTION_LRT_EXCLUDE, "EXCLUDE", 0, "Exclude", "Don't use this collection in line art"},
       {COLLECTION_LRT_INTERSECTION_ONLY,
        "INTERSECTION_ONLY",
        0,
        "Intersection Only",
-       "Only generate intersection lines with this collection"},
+       "Only generate intersection lines for this collection"},
       {COLLECTION_LRT_NO_INTERSECTION,
        "NO_INTERSECTION",
        0,
        "No Intersection",
-       "Do not generate intersection lines for this collection"},
+       "Include this collection but do not generate intersection lines"},
       {0, NULL, 0, NULL, NULL}};
 
   prop = RNA_def_property(srna, "lineart_usage", PROP_ENUM, PROP_NONE);
   RNA_def_property_enum_items(prop, rna_collection_lineart_usage);
-  RNA_def_property_ui_text(prop, "Usage", "How to use this collection in LRT");
+  RNA_def_property_ui_text(prop, "Usage", "How to use this collection in line art");
   RNA_def_property_update(prop, NC_SCENE, NULL);
 
   prop = RNA_def_property(srna, "color_tag", PROP_ENUM, PROP_NONE);