gui, man, authors: Update docs, translations, and contributors

AUTHORS

@@ -300,6 +300,7 @@ Scott Klupfel (kluppy) <[email protected]>
 sec65 <[email protected]>
 Sergey Mishin (ralder) <[email protected]>
 Sertonix <[email protected]>
+Severin von Wnuck-Lipinski <[email protected]>
 Shaarad Dalvi <[email protected]> <[email protected]>
 Simon Frei (imsodin) <[email protected]>
 Simon Mwepu <[email protected]>