[tldoc] Untranslatable string in install-tl

[Nikola Lečić]

Hi,

"custom selection of collections" should be made translatable.

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