Violentmonkey provides userscripts support for Chromium-based Opera.
Violentmonkey for Opera Presto: https://github.com/Violentmonkey/Violentmonkey-oex
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You may download
src/_locales/en/messages.jsonand translate it into your own language, and then make a pull request. -
If you are working with an existed language file, the newly added items will have empty
messages. You may then check outsrc/_locales/en/messages.jsonfor the English version and translate it.