When updating, change these files (if needed):

- AUTHORS
- ChangeLog (**)
- CREDITS
- configure.ac (VERSION)
- manpage version and date
- src/text.c (years in Copyright lines near EOF)
- test Debian packaging

-> run 'make update-po' in po/ to update the .po files.

(**) $ git shortlog -w80,0 --format='* %s' 2.13.1..v2.14
