[Blender] Blenderスクリプトを多言語対応させる方法 ref: http://qiita.com/nutti/items/adcf4feb45135d649105

file1.py

{locale: {(context, key): translated_str, ...}, ...}

file2.py

translation_dict = {
    "en_US" :
        {("*", "Test: ") : "Test: %d"},
    "ja_JP" :
        {("*", "Test: ") : "てすと: %d"}
}

file3.py

>>> bpy.app.translations.locale
'en_US'

file4.py

bpy.app.translations.register(__name__, translation_dict)

file5.py

bpy.app.translations.pgettext("Test: ") 

file6.py

bpy.app.translations.pgettext("Test: ") % (num)

file7.py

bpy.app.translations.unregister(__name__)

translation.py

import bpy

bl_info = {
    "name" : "Translation Test",
    "author" : "Nutti",
    "version" : (0, 1),
    "blender" : (2, 7, 0),
    "location" : "UV > Translation Test",
    "description" : "Translation Test",
    "warning" : "",
    "wiki_url" : "",
    "tracker_url" : "",
    "category" : "UV"
}

# 翻訳用辞書
translation_dict = {
    "en_US" :
        {("*", "Test: ") : "Test: %d"},
    "ja_JP" :
        {("*", "Test: ") : "てすと: %d"}
}


class TranslationTest(bpy.types.Operator):
    bl_idname = "uv.translation_test"
    bl_label = "Translation Test"
    bl_description = "Translation Test"
    bl_options = {'REGISTER', 'UNDO'}

    def execute(self, context):
        num = 50
        # 翻訳結果を通知バーに表示
        self.report({'INFO'}, bpy.app.translations.pgettext("Test: ") % (num))
        return {'FINISHED'}


def menu_func(self, context):
    self.layout.separator()
    self.layout.operator(TranslationTest.bl_idname)


def register():
    bpy.utils.register_module(__name__)
    bpy.types.VIEW3D_MT_uv_map.append(menu_func)
    bpy.app.translations.register(__name__, translation_dict)   # 辞書の登録


def unregister():
    bpy.app.translations.unregister(__name__)   # 辞書の削除
    bpy.utils.unregister_module(__name__)
    bpy.types.VIEW3D_MT_uv_map.remove(menu_func)


if __name__ == "__main__":
    register()