Use more common name for e-mail

program/localization/en_GB/labels.inc

@@ -24,7 +24,7 @@ $labels['password'] = 'Password';
 $labels['server'] = 'Server';
 $labels['login'] = 'Login';
 $labels['logout'] = 'Logout';
-$labels['mail'] = 'E-Mail';
+$labels['mail'] = 'Email';
 $labels['settings'] = 'Personal Settings';
 $labels['addressbook'] = 'Address Book';
 $labels['inbox'] = 'Inbox';
@@ -204,7 +204,7 @@ $labels['receiptnote'] = 'Note: This receipt only acknowledges that the message
 $labels['name'] = 'Display name';
 $labels['firstname'] = 'First name';
 $labels['surname'] = 'Last name';
-$labels['email'] = 'E-Mail';
+$labels['email'] = 'Email';
 $labels['addcontact'] = 'Add new contact';
 $labels['editcontact'] = 'Edit contact';
 $labels['contacts'] = 'Contacts';

program/localization/en_US/labels.inc

@@ -28,7 +28,7 @@ $labels['login']     = 'Login';
 
 // taskbar
 $labels['logout']   = 'Logout';
-$labels['mail']     = 'E-Mail';
+$labels['mail']     = 'Email';
 $labels['settings'] = 'Settings';
 $labels['addressbook'] = 'Address Book';
 
@@ -254,7 +254,7 @@ $labels['organization'] = 'Company';
 $labels['department']   = 'Department';
 $labels['gender']       = 'Gender';
 $labels['maidenname']   = 'Maiden Name';
-$labels['email']        = 'E-Mail';
+$labels['email']        = 'Email';
 $labels['phone']        = 'Phone';
 $labels['address']      = 'Address';
 $labels['street']       = 'Street';