Rename typehead.html to species_typehead.html

I was making changes to this file and was worried about what I might break, so I grepped and found out it is only used for species partials. Since that is the case, I've given it a more explicit name so future developers need not worry that they are changing a very general template, as the name typeahead.html implies
Update text content

fixes #1099 on github.
Merge pull request #1138 from steventlamb/topic/text_changes

Topic/text changes