Improve source lang handling

data/src/jvmMain/kotlin/ca/gosyer/data/models/Source.kt

@@ -19,7 +19,15 @@ data class Source(
     val isNsfw: Boolean,
     val displayName: String
 ) {
+    val displayLang: String
+    get() = if (id == LOCAL_SOURCE_ID) {
+        "other"
+    } else {
+        lang
+    }
+
     companion object {
         const val LOCAL_SOURCE_LANG = "localsourcelang"
+        const val LOCAL_SOURCE_ID = 0L
     }
 }