help: Add article for supported browsers.

Creates new help article for supported web browsers. Also updates
links in the `/apps` landing page as well as the unsupported-browser
template and the `set-up-your-account` article.

Fixes #14732.

help/include/set-up-your-account.md

@@ -3,7 +3,8 @@
     If this is your first time using Zulip, we recommend starting with the web
     or desktop experience to set up your account and get oriented.
 
-- Get the [mobile and desktop apps](/apps). Zulip also works great in a browser.
+- Get the [mobile and desktop apps](/apps). Zulip also works great in a
+  [browser](/help/supported-browsers).
 
 - [Add a profile picture](/help/change-your-profile-picture) and
   [edit your profile information](/help/edit-your-profile) to tell others

help/include/sidebar_index.md

@@ -131,6 +131,7 @@
 ## Apps
 * [Desktop installation guides](/help/desktop-app-install-guide)
 * [Zulip in a Terminal](/help/zulip-in-a-terminal)
+* [Supported browsers](/help/supported-browsers)
 * [Connect through a proxy](/help/connect-through-a-proxy)
 * [Use a custom certificate](/help/custom-certificates)
 

help/supported-browsers.md

@@ -0,0 +1,25 @@
+# Supported browsers
+
+In addition to the [mobile and desktop apps](https://zulip.com/apps/),
+Zulip works great in all major modern web browsers. We recommend
+pinning the Zulip tab in your favorite browser, so that it's always
+easy to find.
+
+For the best user experience, the latest stable versions of the
+browsers below are recommended.
+
+* [Chrome](https://www.google.com/chrome/)
+* [Firefox](https://mozilla.org/en-US/firefox/browsers/)
+* [Edge](https://microsoft.com/en-us/edge/)
+* [Safari](https://apple.com/safari/)
+
+## Cross-protocol apps
+
+Zulip is supported by most multi-protocol desktop chat apps like
+[Rambox](https://rambox.pro) and [Ferdium](https://ferdium.org/).
+
+We recommend choosing a product in this space that regularly releases
+security updates; several popular cross-protocol Electron apps have
+gone defunct over the years. Using a poorly maintained Electron app is
+a major security risk similar to using an old version of Chrome with
+dozens of published security vulnerabilities.

templates/corporate/apps.html

@@ -67,8 +67,9 @@
             </a>
         </div>
         <div id="third-party-apps">
-            Zulip also works great in pinned browser tabs and
-            multi-protocol desktop chat apps
+            Zulip also works great in pinned
+            <a href="/help/supported-browsers">browser tabs</a>
+            and multi-protocol desktop chat apps
             like <a href="https://rambox.pro">Rambox</a>
             and <a href="https://ferdium.org/">Ferdium</a>.
         </div>

templates/zerver/unsupported_browser.html

@@ -19,9 +19,9 @@
                         {% endtrans %}
                     </p>
                     <p>
-                        {% trans %}
-                        Zulip supports modern browsers like Firefox,
-                        Chrome, and Edge.
+                        {% trans supported_browsers_page_link="/help/supported-browsers" %}
+                        Zulip supports <a href="{{ supported_browsers_page_link }}">modern browsers</a>
+                        like Firefox, Chrome, and Edge.
                         {% endtrans %}
                     </p>
                     <p>