Improved grammar

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

@@ -677,7 +677,7 @@
 "_error_user_not_available_"            = "The user is no longer available";
 "_server_response_error_"               = "Server response content error";
 "_no_nextcloud_found_"                  = "Nextcloud server not found";
-"_error_decompressing_"                 = "Error decompressing unknown compression method or the file is corrupt";
+"_error_decompressing_"                 = "Error during decompressing. Unknown compression method or the file is corrupt";
 
 // BKPasscode