Feature/accessibility languages

We should update these texts as soon as we've received the new design (0.6) again, so not paying too much detailed attention to it now.

Note: The TODO's about configurable texts is to remind that we need to edit these in both languages, which is risky because we've already got an open branch for this: !37 (merged)

There's also 3 texts in the history page which aren't extracted strings yet. These were already extracted and editted in the same open branch, so these will also be translated in that branch to prevent merge conflicts.

(all assuming that the branch will be merged after this one)