[ templates ] language to _language migration
[ templates ] language to _language migration

fixes #35

ael-code/libreant,g3-3k/libreant,insomnia-lab/libreant,leophys/libreant,insomnia-lab/libreant,insomnia-lab/libreant,leophys/libreant,leophys/libreant,boyska/libreant,ael-code/libreant,g3-3k/libreant,boyska/libreant,ael-code/libreant,boyska/libreant,insomnia-lab/libreant,leophys/libreant,g3-3k/libreant,g3-3k/libreant,boyska/libreant,ael-code/libreant