Add 'Royal Society' to the list of funder checkboxes
Move the form help buttons to be positioned next to the field labels
Fix modals title styles
Allow a custom link label to be defined for the addendumlink widget
Make the comments field smaller in height
Add a checkbox for the user to state he doesn't know the acceptance date
Other funder field updates

* Remove the other funder checkbox option
* Always show the other funder input field
* Replace the other funder input field with a textarea
Form addendum changes

* Remove the addendum radio buttons
* Move the addendum information to be displayed after the acceptance date field
Implement form content and copy updates
Remove unused translation keys
Sort the publicationform widget translation keys alphabetically
Fix rendered form values not being encoded for HTML
Fix the journals autocompletion box being cut off
Update the forms error styles

* Make the error labels smaller with font-size 16px
* Keep the input placeholder colour gray, even when there is an error
* Give errored fields a red border
Replace form help modals with bootstrap popovers
Move general form styles to avocet.base.css
Merge pull request #314 from timdegroote/form-updates

Publicationform widget updates