It seems like in this build, the plugin shows language names from the `/Applications/Geany.app/Contents/Resources/share/enchant/AppleSpell.config` file (seems to be https://github.com/AbiWord/enchant/blob/master/providers/AppleSpell.config) and ignores user's dictionaries.
`Applications/Geany.app/Contents/Resources/lib/enchant-2` directory only has `enchant_applespell.so`, so maybe there should be the Hunspell plugin instead (or in addition to)?