fix(i18n): localize application workflows

Use stable checklist and interview keys for system copy while preserving user-authored content. Localize creation-tab errors, language selectors, match bands, dates, and selected-CV context.

JobTrackerApi.Tests/ApplicationIntelligenceTests.cs

@@ -420,4 +420,27 @@ public sealed class ApplicationIntelligenceTests
         Assert.Contains("C#", match.MatchedSkills);
         Assert.DoesNotContain(match.MissingSkills, value => value.Equals("utvikler", StringComparison.OrdinalIgnoreCase));
     }
+
+    [Fact]
+    public async Task Match_reports_language_mismatch_when_no_translation_is_available()
+    {
+        var (db, intelligence, _) = New("user-1");
+        await using var _d = db;
+        var job = await SeedJobAsync(db, "user-1", j =>
+        {
+            j.Description = "Vi søker en utvikler som kan bygge robuste systemer og gode tjenester.";
+            j.DescriptionLanguage = null; // Exercise detector fallback for manually created jobs.
+            j.TranslatedDescription = null;
+        });
+        await SeedProfileAsync(db, "user-1");
+        await AttachCvAsync(db, "user-1", job.Id, new CvVariantSettings { Language = "en" });
+
+        var match = await intelligence.MatchAsync("user-1", job.Id, default);
+
+        Assert.NotNull(match);
+        Assert.Equal("nb", match!.JobLanguage);
+        Assert.Equal("en", match.CvLanguage);
+        Assert.True(match.LanguageMismatch);
+        Assert.False(match.UsedTranslatedJobDescription);
+    }
 }