changing "favourites" to the more typical American English usage of "favorites". Mostly American funding and user base, we should use American spelling preferences.
Added an "Others" option to the Species dropdown as requested in #2992.

* closes #2992
* interested parties can create individual widgets for species (like
  E. coli OP50) as desired.
removed issues as a search option
Merge pull request #3096 from WormBase/staging

bringing ui branch up-to-date
Merge pull request #3075 from WormBase/ws245_ui

Some small UI changes for WS245
In any case, the concern is rather minor and isolated. I will merge this for now.