My src\Locale\pr_IR file is like
msgid "Mobile"
msgstr "موبایل"
msgid "mobile"
msgstr "موبایل"
msgid "MoBiLe"
msgstr "موبایل"
Is it possible to convert this to something like
msgid "Mobile"
msgid "mobile"
msgid "MoBiLe"
msgstr "موبایل"
No it's not, at least not without creating your own PO file parser that would handle such an invalid/non-standard PO format.
See also