Updated calculators config & lang files for #419

DEVELOPERS.md

src/app/calculators/bief/en.json

src/app/calculators/bief/fr.json

src/app/calculators/courberemous/en.json

src/app/calculators/courberemous/fr.json

src/app/calculators/grille/config.json

src/app/calculators/grille/en.json

src/app/calculators/grille/fr.json

src/app/calculators/macrorugocompound/config.json

src/app/calculators/macrorugocompound/en.json

src/app/calculators/macrorugocompound/fr.json

src/app/calculators/regimeuniforme/en.json

src/app/calculators/regimeuniforme/fr.json

src/app/calculators/sectionparametree/en.json

src/app/calculators/sectionparametree/fr.json

src/app/calculators/spp/config.json

src/app/calculators/spp/en.json

src/app/calculators/spp/fr.json

src/app/calculators/trigo/en.json

src/app/calculators/trigo/fr.json