Some small UI changes for WS245

Some small UI changes for WS245:

* added an "Others" option at the bottom of the Species menu so that we can add information and links for other species of interest.  This directs to a placeholder page at the moment. It will be populated using the "Create Widget" function, with the intent of one widget per other species of interest.
* Switched to American English since a) most of our users are located in the U.S. and b) our funding by and large comes from there.