fix(i18n): 지원하지 않는 원문 언어 번역 작업을 제외한다

src/main/kotlin/kr/co/vividnext/sodalive/i18n/translation/TranslationJobScheduler.kt

@@ -21,6 +21,8 @@ class TranslationJobScheduler(
         if (normalizedText.isBlank()) return
 
         val normalizedSourceLanguage = sourceLanguage.lowercase()
+        if (!SUPPORTED_SOURCE_LANGUAGE_CODES.contains(normalizedSourceLanguage)) return
+
         val normalizedTargetLanguage = targetLanguage.lowercase()
         if (normalizedSourceLanguage == normalizedTargetLanguage) return
 
@@ -47,4 +49,8 @@ class TranslationJobScheduler(
             )
         )
     }
+
+    companion object {
+        private val SUPPORTED_SOURCE_LANGUAGE_CODES = setOf("ko", "en", "ja")
+    }
 }