GREG-53: Fixing comments from code review

frontend/public/locales/en/common.json

@@ -18,7 +18,7 @@
   "firstName": "First name",
   "lastName": "Last name",
   "dateOfBirth": "Date of birth",
-  "nationalIdNumber": "Fødselsnummer",
+  "nationalIdNumber": "National ID number",
   "validation": {
     "invalidIdNumber": "Invalid national ID number",
     "nationalIdNumberRequired": "National ID number required"

frontend/public/locales/nn/common.json

@@ -19,6 +19,7 @@
   "firstName": "Fornamn",
   "lastName": "Etternamn",
   "dateOfBirth": "Fødselsdato",
+  "nationalIdNumber": "Fødselsnummer",
   "validation": {
     "invalidIdNumber": "Ugyldig fødselsnummer",
     "nationalIdNumberRequired": "Fødselsnummer er påkrevd"

frontend/src/routes/register/index.tsx

@@ -60,7 +60,7 @@ export default function Register() {
         />
         <StyledInput
           {...register("national_id_number", {
-            required: t('validation:nationalIdNumberRequired').toString(),
+            required: t('common:validation.nationalIdNumberRequired').toString(),
             validate: isValidFnr
           })}
           placeholder={t('nationalIdNumber')}