Add missing error messages to onboarding form

Author: Nateowami

src/SIL.XForge.Scripture/ClientApp/src/app/translate/draft-generation/draft-signup-form/draft-onboarding-form.component.html

@@ -69,6 +69,9 @@ <h1>{{ t("title") }}</h1>
                   formControlName="translationLanguageName"
                   [placeholder]="t('translation_language_name_placeholder')"
                 />
+                @if (signupForm.controls.translationLanguageName.hasError("required")) {
+                  <mat-error>{{ t("translation_language_name_required") }}</mat-error>
+                }
               </mat-form-field>
             </div>
 
@@ -80,6 +83,9 @@ <h1>{{ t("title") }}</h1>
                   formControlName="translationLanguageIsoCode"
                   [placeholder]="t('translation_language_iso_placeholder')"
                 />
+                @if (signupForm.controls.translationLanguageIsoCode.hasError("required")) {
+                  <mat-error>{{ t("translation_language_iso_required") }}</mat-error>
+                }
               </mat-form-field>
             </div>
 

src/SIL.XForge.Scripture/ClientApp/src/assets/i18n/non_checking_en.json

@@ -972,8 +972,10 @@
     "title": "Sign up for draft generation",
     "translation_language_iso_label": "Translation language ISO code",
     "translation_language_iso_placeholder": "e.g. swa, tpi",
+    "translation_language_iso_required": "Translation language ISO code is required",
     "translation_language_name_label": "Translation language name",
-    "translation_language_name_placeholder": "e.g. Swahili, Tok Pisin"
+    "translation_language_name_placeholder": "e.g. Swahili, Tok Pisin",
+    "translation_language_name_required": "Translation language name is required"
   },
   "users": {
     "collaborators": "Collaborators",