Fix template bibliography stub

The default line to include bibliography must be correct to avoid making
people think it does not work with BibTeX.
Bump dependency versions

Both tiscaf and diffson have been released, the SNAPSHOT versions are no
longer available.
Merge branch 'fix/default-template-bibliography' of github.com:satabin/bluelatex into satabin-fix/default-template-bibliography
Merge branch 'satabin-fix/default-template-bibliography'
Improve the French translation
[fix #127] Improve English translation