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definitions: Add duplicates to Z60/Language definitions as alias codes and de…

Description

definitions: Add duplicates to Z60/Language definitions as alias codes and de-dupe

In all but one case, keep the old main language code, except for Z1132/Belarusian,
where instead of the MediaWiki-specific 'be-x-old' we'll now have the primary code
be 'be-tarask', with the former code used as an alias.

Bug: T283605
Change-Id: I408408c9d14117b5f29e25b04257b32a5e4a8f74