i18n: Fix untranslated strings in facets

[mesemus]

Description

User and domain translations are not working, even though they are wrapped in _(...). The reason is gettext is used which performs the translation during module initialization and not when the facets are rendered.

This PR fixes this by using lazy_gettext instead.

Checklist

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• I've created logical separate commits and followed the commit message format.
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• I've marked translation strings.
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