The Grease Pencil 3.0 layers and groups were not properly translated:
- The layers and groups' names were translated during display in the
layer list. Since they are data, they should be left untranslated at
this time.
- On object creation, the names "GP_Layer", "Color", "Lines", and
"Fills" were not translated at all.
This adds DATA_() macros around to translate them if the user has
enabled translation of new data names.
- The functions returning unique names for layers and groups
unique_layer_group_name() and unique_layer_name() would return
"GP_Layer" and "GP_Group" by default.
These defaults are now translated.
- When adding new layers and groups, the name was always hardcoded to
"GP_Layer" and "GP_Group" because the operators' properties for the
names defaulted to that, and prop defaults cannot be translated.
Instead, make them default to a null string, but choose an
appropriate name when executing the op. This name is chosen by
unique_layer_name() and unique_layer_group_name(), whose defaults
are now translated.
Pull Request: https://projects.blender.org/blender/blender/pulls/112930
e773e0952a