MZ hook and other minor improvements

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Please contribute/update a translation to Textractor if you can! See https://github.com/Artikash/Textractor/blob/master/README.md#contributing

Features:
Translation extensions now use a separate cache for each language.
Various minor performance and UI improvements.

Bugfixes:
Paid DeepL Translate giving strange translations occasionally
Some DeepL Translate API keys not working
'Remove Repeated Characters' failing to detect repetition in edge cases

New hooks:
RPG Maker MZ

By the way, it's actually the previous version which had a breaking change and should've been a new major version. If you used a regex with a capturing group, that behaves differently than prior to 4.17 - you need to add a dummy empty group to the start of your regex and increment all other capture group backrefs for the same behavior.