2.16.0

• Excel export now creates sheets for individual languages used in a vocabulary (kbss-cvut/termit-ui#194).
• Added the possibility to download a file in its current version and the version originally uploaded to TermIt (kbss-cvut/termit-ui#347).
• Minor fixes (kbss-cvut/termit-ui#335, kbss-cvut/termit-ui#184, kbss-cvut/termit-ui#294), improved annotator performance (the document is now not reloaded after a term occurrence is created/confirmed) (kbss-cvut/termit-ui#346).