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

AUTHORS

@@ -49,6 +49,7 @@ Ben Shepherd (benshep) <[email protected]>
 Ben Sidhom (bsidhom) <[email protected]>
 Benedikt Heine (bebehei) <[email protected]>
 Benedikt Morbach <[email protected]>
+Benjamin Nater <[email protected]>
 Benno Fünfstück <[email protected]>
 Benny Ng (tpng) <[email protected]>
 boomsquared <[email protected]>