i18n: Fix untranslated strings in vocabularies

[mesemus]

Description

In a couple of places (administration, jobs, subjects) the texts that will be visible in UI were not marked as translatable or were marked incorrectly with gettext where lazy_gettext should be used. This PR fixes that.

Checklist

Ticks in all boxes and 🟢 on all GitHub actions status checks are required to merge:

• I'm aware of the code of conduct.
• I've created logical separate commits and followed the commit message format.
• I've added relevant test cases.
• I've added relevant documentation.
• I've marked translation strings.
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