Portable build fix: Install missing roman package.
Fixed #1275 (Creating assignment pdf failed)
Merge pull request #1274 from emanuelschuetze/fix-portable

Portable build fix: Install missing roman package.
Merge pull request #1276 from emanuelschuetze/fix-1275

Fixed #1275 (Creating assignment pdf failed)
Cleaned up some widgets and the base.css. Removed icon definitions.