[slack] allow the user to choose the message format to send (#5167)

Co-authored-by: Louis Lam <louislam@users.noreply.github.com>
Co-authored-by: Frank Elsinga <frank@elsinga.de>

src/components/notifications/Slack.vue

@@ -9,6 +9,12 @@
         <label for="slack-channel" class="form-label">{{ $t("Channel Name") }}</label>
         <input id="slack-channel-name" v-model="$parent.notification.slackchannel" type="text" class="form-control">
 
+        <label class="form-label">{{ $t("Message format") }}</label>
+        <div class="form-check form-switch">
+            <input id="slack-text-message" v-model="$parent.notification.slackrichmessage" type="checkbox" class="form-check-input">
+            <label for="slack-text-message" class="form-label">{{ $t("Send rich messages") }}</label>
+        </div>
+
         <div class="form-text">
             <span style="color: red;"><sup>*</sup></span>{{ $t("Required") }}
             <i18n-t tag="p" keypath="aboutWebhooks" style="margin-top: 8px;">

src/lang/en.json

@@ -895,6 +895,8 @@
     "cacheBusterParamDescription": "Randomly generated parameter to skip caches.",
     "gamedigGuessPort": "Gamedig: Guess Port",
     "gamedigGuessPortDescription": "The port used by Valve Server Query Protocol may be different from the client port. Try this if the monitor cannot connect to your server.",
+    "Message format": "Message format",
+    "Send rich messages": "Send rich messages",
     "Bitrix24 Webhook URL": "Bitrix24 Webhook URL",
     "wayToGetBitrix24Webhook": "You can create a webhook by following the steps at {0}",
     "bitrix24SupportUserID": "Enter your user ID in Bitrix24. You can find out the ID from the link by going to the user's profile.",