Zgrmbl re-temporarily replace alert with display_text because CI not on 4.3

manifest.json

@@ -22,7 +22,7 @@
       "install": [
           {
             "name": "disclaimer1",
-            "type": "alert",
+            "type": "display_text",
             "style": "warning",
             "ask": {
                 "en": "Please note that this application only interfaces with **dedicated, public IP VPNs accepting inbound traffic**, preferably with an associated `.cube` (or `.ovpn/.conf`) configuration file. **Do not** expect that any VPN you randomly bought on the Internet can be used! Checkout the [list of known compatible providers](https://yunohost.org/providers/vpn) for more info.",
@@ -31,7 +31,7 @@
         },
         {
             "name": "disclaimer2",
-            "type": "alert",
+            "type": "display_text",
             "style": "info",
             "ask": {
                 "en": "After installing the application, you can configure the application from YunoHost's webadmin in Applications > VPNclient > Configuration.",