feat: add import words helper

src/config/i18n.js

@@ -1468,4 +1468,9 @@ export const I18N = {
     en: `Export old version`,
     zh_TW: `匯出舊版`,
   },
+  favorite_words_helper: {
+    zh: `导入词汇请使用txt文件，每一行一个单词。`,
+    en: `To import vocabulary, please use a txt file with one word per line.`,
+    zh_TW: `匯入詞彙請使用txt文件，每一行一個單字。`,
+  },
 };

src/views/Options/FavWords.js

@@ -15,6 +15,7 @@ import DownloadButton from "./DownloadButton";
 import UploadButton from "./UploadButton";
 import Button from "@mui/material/Button";
 import ClearAllIcon from "@mui/icons-material/ClearAll";
+import Alert from "@mui/material/Alert";
 import { isValidWord } from "../../libs/utils";
 import { kissLog } from "../../libs/log";
 import { apiTranslate } from "../../apis";
@@ -104,6 +105,8 @@ export default function FavWords() {
   return (
     <Box>
       <Stack spacing={3}>
+        <Alert severity="info">{i18n("favorite_words_helper")}</Alert>
+
         <Stack
           direction="row"
           alignItems="center"