Reorders the left sidebar so risky actions sit at the bottom with a gap:
Dashboard, Synchronize, Logout | Change Language (red), Delete Account.
The new Change Language button opens a warning popup with a language
dropdown. On confirm, if the selected locale differs from the current
one, the client calls POST /reset_language. On success it wipes the
local teacher folder (progression, remediation, confusion matrix…),
applies the new language to device and teacher settings, logs out and
reloads from the splash screen. On error the user sees an error popup
and nothing local changes.
Adrien Ufferte
790260e2fd