feat: add translation context for operators and their properties.

- add translation context for operator, menu, panel and etc. and their associated properties.
- improve some name and description but not finished.
- move reset BME material function inside BMEMaterialsHelper.
- rename variable of collection visitor in BME adder operator for clear meaning.
- replace some message box to report in ballance elements reset operator, BME materials reset operator and rail UV operator

bbp_ng/OP_OBJECT_snoop_group_then_to_mesh.py

@@ -7,6 +7,7 @@ class BBP_OT_snoop_group_then_to_mesh(bpy.types.Operator):
     bl_idname = "bbp.snoop_group_then_to_mesh"
     bl_label = "Snoop Group then to Mesh"
     bl_options = {'UNDO'}
+    bl_translation_context = 'BBP_OT_snoop_group_then_to_mesh'
 
     @classmethod
     def poll(cls, context):