media: merge tvdb and trakt languages

util/slice.go

@@ -10,3 +10,34 @@ func StringSliceContains(slice []string, val string) bool {
 	}
 	return false
 }
+
+func StringSliceMergeUnique(existingSlice []string, mergeSlice []string) []string {
+	// add existing
+	data := make([]string, 0)
+	for _, es := range existingSlice {
+		if es == "" {
+			continue
+		}
+		data = append(data, es)
+	}
+
+	// add merge items (unique)
+	for _, ms := range mergeSlice {
+		if ms == "" {
+			continue
+		}
+
+		merge := true
+		for _, es := range data {
+			if strings.EqualFold(es, ms) {
+				merge = false
+				break
+			}
+		}
+
+		if merge {
+			data = append(data, ms)
+		}
+	}
+	return data
+}