i18n: first commit about i18n translation.

- add i18n translation files.
- add document about how to translate this plugin.
- fix some field descriptions in source code.

bbp_ng/.gitignore

@@ -9,6 +9,13 @@ icons/*
 jsons/*
 !jsons/.gitkeep
 
+# Do not include intermidiate translation template (POT)
+# NOTE: it seems that Python default gitignore (written following) disable POT file in default.
+# so, as it wish, I also remove it from git.
+i18n/*
+!i18n/blender.pot
+!i18n/*.po
+
 ## ===== Python =====
 # Byte-compiled / optimized / DLL files
 __pycache__/

bbp_ng/OP_ADDS_rail.py

@@ -415,8 +415,9 @@ class BBP_OT_add_spiral_rail(SharedExtraTransform, SharedRailCapInputProperty, S
 
     rail_screw_screw: bpy.props.FloatProperty(
         name = "Screw",
-        description = "The increased height in each iteration. Minus height also is accepted.",
+        description = "The increased height in each iteration.",
         default = c_SpiralRailScrew,
+        min = 0.0,
         unit = 'LENGTH',
         translation_context = 'BBP_OT_add_spiral_rail/property'
     ) # type: ignore

bbp_ng/OP_OBJECT_legacy_align.py

@@ -62,7 +62,7 @@ class BBP_PG_legacy_align_history(bpy.types.PropertyGroup):
         translation_context = 'BBP_PG_legacy_align_history/property'
     ) # type: ignore
     target_align_mode: bpy.props.EnumProperty(
-        name = "Target Objects (Other Objects)",
+        name = "Target Objects (Selected Objects)",
         items = _g_EnumHelper_AlignMode.generate_items(),
         default = _g_EnumHelper_AlignMode.to_selection(AlignMode.AxisCenter),
         translation_context = 'BBP_PG_legacy_align_history/property'

bbp_ng/blender_manifest.toml

@@ -78,4 +78,5 @@ paths_exclude_pattern = [
   "/raw_jsons", # Raw JSONs.
   "/raw_icons", # Raw Icons.
   "/tools", # Assistant tools.
+  "/i18n", # GNU gettext Translation.
 ]