i18n for all UI text

[TehNut]

Using vue-i18n, the UI text should be made translatable.

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[YellowFish085]

Suggestion: Maybe the default webext i18n implementation would be better to use? That way your internationalization system isn't tied to Vue.js and you can access translated strings outside of the Vue.js app (e.g. background/content scripts and random js files) + it allows you to translate things like the extension name and description on the store.