Clean gitignore
Download links, tag rename, fixes

- Improved: Titles longer than 100 characters are shortened in grid display
- Improved: Using foundation.min.css instead of foundation.css
- Improved: Slightly better admin page...
- New: Added option show_dl_button. Setting to true, tries to create direct download links (experimental)
- New: Added (very rudimentary) possibility to bulk rename tags
- Fixes: Small language changes and try to better adjust to screen sizes