Continued a lot more:

Continued a lot more:
- added ability to link any contact with user and/or customer accounts (later is unfinished)
- to make thism working, a controller method selectableContacts() is needed (cached)
- also the event for administrators adding users (customers missing!) must be observed to remove contact from selectable list
- because of the above, the HTML form can no longer validate required="true", it must be done by the controller (ugly exceptions for now)
- some beans/controllers loaded/injected
- added missing i18n strings
- fixed some exception messages
- ignored strings for i18n
- changed CSS class in admin area pages from small to medium (needs more space)
- removed double underscore (one removed)

Signed-off-by: Roland Häder <roland@mxchange.org>