Adding tabsearch as default template for widget interface

First do some testing

• GET ​http://localhost:99/geonetwork/apps/tabsearch/help_eng.html 404 Not Found (effect: spinner keeps running)
  

• new i18n-keay should be added for common languages (search for spatial data, advanced, help, about, home, map, powered by)
  

• advanced search panel, does not grow/scroll when multiple keywords are added, then slids out of panel
  

• advanced search, map not correctly configured, position upper left corner, no box drawn
  

• when uploading a thumbnail from metadata edit, no warning is shown image is not uploaded, but no image gets attached
  

• when you star a record (actions-star) there is a couple of page-blinks (panel-refreshes up to 10/20)
  

Then some fixing