Fix #318 - new discharge law WeirSubmerged

docs-fr/calculators/structures/fente_noyee.md

docs-fr/calculators/structures/seuil_noye.md

docs-fr/calculators/structures/seuil_noye_schema.png

mkdocs.yml

...ators/parallel-structures/parallel-structures.config.json

...lculators/parallel-structures/parallel-structures.en.json

...lculators/parallel-structures/parallel-structures.fr.json

src/locale/messages.en.json

src/locale/messages.fr.json