只有预览选词翻译才需要这个参数

src/components/CommonPreview.vue

@@ -934,7 +934,6 @@ export default {
       GetLanguageTypeList({
         book_id: this.courseware_info.book_id,
         is_contain_zh: 'true',
-        is_only_can_translation: 'true',
       }).then(({ language_type_list }) => {
         this.langList = language_type_list;
       });

src/views/personal_workbench/edit_task/edit/index.vue

@@ -291,7 +291,6 @@ export default {
       GetLanguageTypeList({
         book_id: this.courseware_info.book_id,
         is_contain_zh: 'true',
-        is_only_can_translation: 'true',
       }).then(({ language_type_list }) => {
         this.langList = language_type_list;
       });