Revert "tidy(ui): translation cleanup and CI checks"

[psychedelicious]

Reverts #8536

Unfortunately it has a flaw. It thinks dynamically-constructed translation keys don't exist. For example, in the Canvas layers panel we do something like this:

const title = `controlLayers.${layerType}_withCount`

Then when the script checks for controlLayers.rasterLayers_withCount, it thinks the key isn't used. The keys is deleted and we see this in the UI:

Will need to return to the challenge of keeping translations cleaned up at a later date.