Update de.ts

Two chnages
Destroy AL context before closing old device

I refuse to compile this code, so it's not tested.
This should fix the segfault in alcDestroyContext.
Update INSTALL.md

Added dependency resolution for Slackware 14.1 users.
add fancier tray icons with status, remove relevant option
Merge branch 'pr899'
Fix include 'Windows.h' -> 'windows.h'

MinGW is case sensitive
Merge branch 'pr878'
Change push to talk shortcut to CTRL+P
Focus the text input area when clicking on the text area
Push to talk with input msgedit focused
Merge branch 'pr857'
Merge branch 'pr884'