Place a PDF manual "little-navmap-user-manual-XX.pdf" with language code "XX" in
this directory to be used on computers that have this language setting.

You can do the same with the legend file "legend-XX.html".

An empty file with name "little-navmap-user-manual-XX.online" indicates
that the language "XX" is also available online on https://albar965.github.io/manuals.html.
This affects all help buttons and the links in the help menu which use the
online help on https://albar965.github.io/manuals.html.