Bug fix: Theme change to centralise progress indicator animation

Adds special (diacritic) characters to German Alpha/ConversationAlpha…

… keyboards and enabled multi-key selection on ConversationAlpha again

Fix: Remove duplicate sleep key on French/German conversation alpha k…

…eyboards and replace with recalibrate

Change German string DIAKRITISCH to UMLAUTE

Fix: Remove duplicate sleep key on French/German conversation alpha k…

…eyboards and replace with recalibrate

Merge branch 'ninehundred1-master'

Attempt to prevent OS culture from being changed by OptiKey

Fix of missing using statements

v2.2.0 (pre-release)