change string

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

@@ -186,7 +186,7 @@
 "_help_intro_"                  = "Introduction _brand_";
 "_help_activity_section_"       = "Activity";
 "_help_Activity_verbose_"       = "Activity verbose high";
-"_help_Activity_mail_"          = "Send activity @Mail";
+"_help_Activity_mail_"          = "Send activity by mail";
 "_help_Activity_clear_"         = "Clear activity";
 
 // Manage Optimizations