Fixed typo

Added some questions for adding context. @marinofaggiana Please see my comments and add some context. Thank you.

Reported at Transifex.

Signed-off-by: rakekniven <mark.ziegler@rakekniven.de>

iOSClient/Supporting Files/en.lproj/Localizable.strings

@@ -154,7 +154,11 @@
 "_away_"                    = "Away";
 "_dnd_"                     = "Do not disturb";
 "_dnd_description_"         = "Mute all notifications";
-"_invisible_"               = "Invidible";
+
+/* Please add context. What is invisible= */
+"_invisible_"               = "Invisible";
+
+/* Please add context. What does apper mean? */
 "_invisible_description_"   = "Apper offline";
 
 // App