The category filter at the top of the topics page doesn’t show subcategories, which is expected. But usually, you can use search to find them. This doesn’t work for me on Meta, probably because of lazy-load-categories. It reminds me of what I reported here Search in category drop-down missing.
This is what I see here without an option to search:
This is what I miss
I would prefer to have a direct path to, for example, the translations category without visiting the parent category first.