Adding localization support to cheevos.c

[toadkarter]

Description

There were some TODOs surrounding unlocalized strings in cheevos.c, so I have added localization support to these in the same style as the rest of the project (i.e., added the relevant info to msg_hash and msg_hash_us.

Hopefully this is in line with what is expected, but if not please do let me know and I would be happy to make any changes.

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