fix:解决统一封面图文案的合并冲突

src/modules/course-manage/components/AddLiveBasic.jsx

@@ -149,7 +149,7 @@ class AddLiveBasic extends React.Component {
               <span className={`default-btn ${isDefaultCover ? 'disabled' : ''}`} onClick={this.handleResetCoverUrl}>
                 使用默认图
               </span>
-              <div className='tips'>建议尺寸1280*720px，图片支持jpg、jpeg、png格式。</div>
+              <div className='tips'>建议尺寸1280*720px或16:9。封面图最大5M，支持jpg、jpeg和png。</div>
             </div>
             <div className='img-content'>
               {isDefaultCover && <span className='tag'>默认图</span>}

src/modules/course-manage/offline-course/AddOfflineCourse.jsx

 /*
  * @Author: 吴文洁
  * @Date: 2020-08-05 10:07:47
- * @LastEditors: Please set LastEditors
- * @LastEditTime: 2021-07-14 11:44:14
+ * @LastEditors: yuananting
+ * @LastEditTime: 2021-07-15 12:08:28
  * @Description: 线下课新增/编辑页
  * @Copyright: 杭州杰竞科技有限公司 版权所有
  */
@@ -751,7 +751,7 @@ class AddOfflineCourse extends React.Component {
                     <span className={`default-btn ${isDefaultCover ? 'disabled' : ''}`} onClick={this.handleResetCoverUrl}>
                       使用默认图
                     </span>
-                    <div className='tips'>建议尺寸1280*720px，图片支持jpg、jpeg、png格式。</div>
+                    <div className='tips'>建议尺寸1280*720px或16:9。封面图最大5M，支持jpg、jpeg和png。</div>
                   </div>
                   <div className='img-content'>
                     {isDefaultCover && <span className='tag'>默认图</span>}

src/modules/course-manage/video-course/AddVideoCourse.jsx

@@ -2,7 +2,7 @@
  * @Author: 吴文洁
  * @Date: 2020-08-05 10:07:47
  * @LastEditors: yuananting
- * @LastEditTime: 2021-07-14 16:41:36
+ * @LastEditTime: 2021-07-15 12:04:40
  * @Description: 线上课新增/编辑页
  * @Copyright: 杭州杰竞科技有限公司 版权所有
  */
@@ -821,7 +821,7 @@ class AddVideoCourse extends React.Component {
                   </If>
 
             <div className='cover-url flex mt16'>
-              <div className='label'>课程封面：</div> 
+              <div className='label'>封面图：</div> 
               <div className='cover-url__wrap'>
                 <div className='opt-btns'>
                   <div>