OF-250: Allow to configure the groups of a user from the user profile

* simplified the UI
* added search for groups
* pagination for available groups

src/i18n/openfire_i18n_en.properties

@@ -537,13 +537,11 @@
 ##      Added key: 'server.properties.encrypt_confirm'
 ##
 ## 3.10.0
-##      Added key: 'user.properties.additional_propertie'
+##      Added key: 'user.properties.additional_properties'
 ##      Added key: 'user.groups.title'
 ##      Added key: 'user.groups.info'
+##      Added key: 'user.groups.member.info'
 ##      Added key: 'user.groups.name'
-##      Added key: 'user.groups.none'
-##      Added key: 'user.groups.member'
-##      Added key: 'user.groups.admin'
 ##      Added key: 'user.groups.form.update'
 
 # Openfire
@@ -2568,10 +2566,8 @@ user.lockout.time.minutes=minutes
 
 user.groups.title=User Groups
 user.groups.info=Below is a list of groups available for the user
+user.groups.member.info=Below is a list of groups for user
 user.groups.name=Group Name
-user.groups.none=None
-user.groups.member=Member
-user.groups.admin=Admin
 user.groups.form.update=User groups edited successfully.
 
 # Plugins Admin Page