[tldoc] Updated and polished sr.po, tlmgrgui r18231

[Nikola Lečić]

Please commit this updated and polished install-tl/tlmgr sr.po:

  http://anthesphoria.net/FreeBSD/TeXLive-Devel/translations/sr-r18231.po

(Btw, it would be nice to make "Don't know from where to restore
backups" translatable.)

Regards,
-- 
Nikola Lečić = Никола Лечић
fingerprint : FEF3 66AF C90E EDC3 D878  7CDC 956D F4AB A377 1C9B
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