!1014 UI saliency-map / add description tip for filter image function

From: @weiyanxi
Reviewed-by: @xia_yi_fan1,@lilongfei15,@wenkai_dist
Signed-off-by: @wenkai_dist

mindinsight/ui/src/locales/en-us.json

@@ -759,6 +759,7 @@
     "originalPicture": "Original Image",
     "forecastTag": "Prediction Tag",
     "tag": "Tag",
+    "tagTip": "Query the image data that contains any filter label",
     "confidence": "Probability",
     "forecastTagTip": "When the inference image has the correct tag, the following four flags are displayed in the tag row",
     "TP": "TP, indicates true positive. The tag is a positive sample, and the classification is a positive sample;",

mindinsight/ui/src/locales/zh-cn.json

@@ -755,6 +755,7 @@
     "originalPicture": "原始图片",
     "forecastTag": "预测标签",
     "tag": "标签",
+    "tagTip": "查询包含任一筛选标签的图片数据",
     "confidence": "概率",
     "forecastTagTip": "当推理图片带有正确标签时，标签行会显示下列四种旗标",
     "TP": "TP，代表Ture Positive，标签为正样本，分类为正样本；",

mindinsight/ui/src/views/explain/saliency-map.vue

@@ -57,7 +57,17 @@ limitations under the License.
     <!-- Parameters Fetch -->
     <div class="cl-saliency-map-condition">
       <div class="condition-left">
-        <div class="condition-item line-title">{{ $t('explain.tag') }}</div>
+        <div class="condition-item line-title">
+          {{ $t('explain.tag') }}
+          <el-tooltip placement="bottom-start"
+                      effect="light">
+            <div slot="content"
+                 class="tooltip-container">
+                {{$t('explain.tagTip')}}
+            </div>
+            <i class="el-icon-info"></i>
+          </el-tooltip>
+        </div>
         <!-- Truth Labels -->
         <div class="condition-item search-select">
           <search-select multiple