Update README.md
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Update Chinese (Simplified) translation
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Merge pull request #2 from darktrojan-test/zh-TW

Update Chinese (Traditional) translation
Merge pull request #3 from darktrojan-test/zh-CN

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Merge pull request #4 from darktrojan-test/de

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Activate new locales
Bump Firefox version
Merge branch 'unreleased'