account-settings: Rename "API key" button.

Renames button to "Manage your API key", and updates docs
accordingly.

Fixes part of #28881.

api_docs/api-keys.md

@@ -17,7 +17,7 @@ Anyone with your API key can impersonate you, so be doubly careful with it.
 
 {settings_tab|account-and-privacy}
 
-1. Under **API key**, click **Show/change your API key**.
+1. Under **API key**, click **Manage your API key**.
 
 1. Enter your password, and click **Get API key**. If you don't know your
    password, click **reset it** and follow the

templates/zerver/integrations/google-calendar.md

@@ -20,7 +20,7 @@ your reminders directly in your Zulip feed.
     then clicking on **Personal settings**.
 
 1.  Click on the tab that’s labeled **Account & privacy** and click on
-    **Show/change your API key**. Enter your password if prompted, and
+    **Manage your API key**. Enter your password if prompted, and
     download the `zuliprc` file. Save this file as `.zuliprc` to your `~/`
     directory.
 

web/templates/settings/account_settings.hbs

@@ -127,7 +127,7 @@
                 </p>
                 <div id="api_key_button_container" class="inline-block {{#unless user_has_email_set}}disabled_setting_tooltip{{/unless}}">
                     <button class="button rounded" id="api_key_button" {{#unless user_has_email_set}}disabled="disabled"{{/unless}}>
-                        {{t "Show/change your API key" }}
+                        {{t "Manage your API key" }}
                     </button>
                 </div>
             </div>