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'
Fixed language error.
Added translation.
Added Translation for error message on sending a file. Also included the German Version.
Update chatform.cpp

Improved that line of code.
Thanks to @dubslow
Merge branch 'pr912'
Update INSTALL.md
Merge branch 'pr914'
check for no systray, fixes #908
cant believe it took this long to figure out ;_;