userportal, webadmin: added IDs to locale boxes, welcome page links

Added element IDs to some elements to help with Selenium tests:
* locale drop-down in welcome page
* locale drop-down in UserPortal & WebAdmin login screen
* all links in welcome page template

Change-Id: Ic456286d03a906d3cc8c224050504a0f4e4b2d6c
Signed-off-by: Greg Sheremeta <gshereme@redhat.com>