Merge pull request #531 from naturwerk/master

Back to master
added loading gif
implemented agree functionality
refactoring
add and replace votes dynamically (client side)
bug fix
refactoring #1
refactoring #2
implemented comments
refactored verification box
implemented comment display, fixed bar charts
Return translated and scientific names and the id of an organism after
save
refactored translations in JS
implemented artgroup, organism and observation filters
Artgroup ID Reset fix
refactoring
Error message when no observations are available for the selected
artgroup
Loading gif replaced
always show artgroup filter box
made no observations error message more noticeable