Aside from actually writing translations, there are some issues with the way the code produces output. Most of the UI should support right-to-left (RTL) languages.
Labels
Labels and their values are defined in project.config by the Gerrit administrator or project owners. Only a single translation of these strings is supported.
/Gerrit Gerrit.html
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The title of the host page is not translated.
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The <noscript> tag is not translated.
Part of Gerrit Code Review