fix i18n keys

resource/locales/en_US/admin/admin.json

@@ -272,7 +272,7 @@
       "security_control": "Security control",
       "easy": "Easy",
       "normal": "Normal",
-      "difficult": "Hard",
+      "hard": "Hard",
       "possible": "Possible",
       "impossible": "Impossible"
     },

resource/locales/ja_JP/admin/admin.json

@@ -270,7 +270,7 @@
       "security_control": "セキュリティコントロール",
       "easy": "かんたん",
       "normal": "ふつう",
-      "difficult": "むずかしい",
+      "hard": "むずかしい",
       "possible": "可能",
       "impossible": "不可"
     },

resource/locales/zh_CN/admin/admin.json

@@ -280,7 +280,7 @@
       "security_control": "安全控制",
       "easy": "简单",
       "normal": "通常",
-      "difficult": "难的",
+      "hard": "难的",
       "possible": "可能的",
       "impossible": "不可能"
     },

src/client/js/components/Admin/SlackIntegration/SlackIntegration.jsx

@@ -249,7 +249,7 @@ const SlackIntegration = (props) => {
                   <div className="my-4">
                     <div className="d-flex justify-content-between mb-2">
                       {showBotTypeLabel('set_up')}
-                      {showBotTypeDiscription('difficult')}
+                      {showBotTypeDiscription('hard')}
                     </div>
                     <div className="d-flex justify-content-between mb-2">
                       {showBotTypeLabel('multiple_workspaces_integration')}

src/client/styles/scss/theme/_apply-colors.scss

@@ -602,7 +602,7 @@ mark.rbt-highlight-text {
   .bot-type-disc-normal {
     color: #e6a63c;
   }
-  .bot-type-disc-difficult {
+  .bot-type-disc-hard {
     color: #ff5757;
   }
   .bot-type-disc-possible {