show safe mode warning dialog in prefs

js/App.js

@@ -820,6 +820,10 @@ const App = {
             App.updateRuntimeInfo();
          }, 60 * 1000)
 
+		if (App.getInitParam("safe_mode") && this.isPrefs()) {
+			CommonDialogs.safeModeWarning();
+		}
+
       console.log("second stage ok");
 
    },

js/CommonDialogs.js

@@ -11,6 +11,21 @@ const	CommonDialogs = {
 			const dialog = dijit.byId("infoBox");
 			if (dialog)	dialog.hide();
 		},
+		safeModeWarning: function() {
+			const dialog = new fox.SingleUseDialog({
+				title: __("Safe mode"),
+				content: `<div class='alert alert-info'>
+						${__('Tiny Tiny RSS is running in safe mode. All themes and plugins are disabled. You will need to log out and back in to disable it.')}
+					</div>
+					<footer class='text-center'>
+						<button dojoType='dijit.form.Button' type='submit' class='alt-primary'>
+							${__('Close this window')}
+						</button>
+					</footer>`
+			});
+
+			dialog.show();
+		},
 		subscribeToFeed: function() {
 			xhr.json("backend.php",
 					{op: "feeds", method: "subscribeToFeed"},

js/Feeds.js

@@ -278,19 +278,8 @@ const	Feeds = {
 		}
 
 		if (App.getInitParam("safe_mode")) {
-			const dialog = new fox.SingleUseDialog({
-				title: __("Safe mode"),
-				content: `<div class='alert alert-info'>
-						${__('Tiny Tiny RSS is running in safe mode. All themes and plugins are disabled. You will need to log out and back in to disable it.')}
-					</div>
-					<footer class='text-center'>
-						<button dojoType='dijit.form.Button' type='submit' class='alt-primary'>
-							${__('Close this window')}
-						</button>
-					</footer>`
-			});
-
-			dialog.show();
+			/* global CommonDialogs */
+			CommonDialogs.safeModeWarning();
 		}
 
 		// bw_limit disables timeout() so we request initial counters separately