Improve #221

...calculators/macrorugo-compound/macrorugo-compound.en.json

...calculators/macrorugo-compound/macrorugo-compound.fr.json

src/app/components/field-set/field-set.component.ts

...pp/components/fixedvar-results/fixed-results.component.ts

src/app/formulaire/definition/form-compute-fixedvar.ts

src/app/results/calculator-results.ts

src/app/results/var-results.ts

...ices/internationalisation/internationalisation.service.ts

src/locale/messages.en.json

src/locale/messages.fr.json