I've recently develop a new module the module name in manifest file is Extra Hours so i've made a translation .po file and added this line of codes:
#. module: base
#: model:ir.module.module,shortdesc:base.module_ru_extra_hours
msgid "Extra Hours "
msgstr "اضافه کاری"
The problem is that the name stay the same "Extra Hours" and the translation not applied.
Thanks the problem has solved