Add built-in plurals for es, fr, de.

Merge branch 'branches/2.0'

Merge branch 'branches/2.0'

Fix startup error.

Fix #25: make templates directory relative to mkdocs.yml.

Fix version numbering.

Release v1.7.0.

Merge remote-tracking branch 'origin/main' into branches/1.7

Fix config debug logging.

release v1.6.10.