A discourse plugin allows the add of tags for each topic:
https://meta.discourse.org/t/tagger-tags-for-topics/14573
Maybe using both categories and tags, we can achieve something compatible with a multi-language forum ?
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I just updated the forum with the Tagger plugin which permits to add tags in addition to the main category. Therefore we simplified the categories list by removing some sub-categories.
The current list of tag is available here and you can add them easily when writing or editing a topic:
The list cannot be extended by low-level user so if you need other tags do not hesitate to ask it here.