fix(i18n): 지원하지 않는 원문 언어 번역 작업을 제외한다

src/test/kotlin/kr/co/vividnext/sodalive/i18n/translation/TranslationJobSchedulerTest.kt

@@ -84,4 +84,21 @@ class TranslationJobSchedulerTest {
 
         Mockito.verify(jobRepository, Mockito.never()).save(Mockito.any(TranslationJob::class.java))
     }
+
+    @Test
+    fun shouldNotCreateJobWhenSourceLanguageIsUnsupported() {
+        val jobRepository = Mockito.mock(TranslationJobRepository::class.java)
+        val scheduler = TranslationJobScheduler(jobRepository)
+
+        scheduler.scheduleMissingTranslation(
+            resourceType = LanguageTranslationTargetType.CONTENT,
+            resourceId = 10L,
+            fieldKey = "title",
+            sourceText = "제목",
+            sourceLanguage = "fr",
+            targetLanguage = "en"
+        )
+
+        Mockito.verifyNoInteractions(jobRepository)
+    }
 }