MM-11508 Update help text for link previews admin console setting (ma…

…ttermost#1722)

* Update admin_definition.jsx

* Update en.json

components/admin_console/admin_definition.jsx

@@ -2385,7 +2385,7 @@ export default {
  label: 'admin.customization.enableLinkPreviewsTitle',
  label_default: 'Enable Link Previews:',
  help_text: 'admin.customization.enableLinkPreviewsDesc',
- help_text_default: 'Display a preview of website content below messages, when available. Users can disable these previews from Account Settings > Display > Website Link Previews.',
+ help_text_default: 'Display a preview of website content below messages, when available. Users can disable these previews from Account Settings > Display > Website Link Previews. This setting only applies to websites with OpenGraph metadata and not for image links or YouTube previews.',
  },
  {
  type: Constants.SettingsTypes.TYPE_CUSTOM,

i18n/en.json

@@ -309,7 +309,7 @@
  "admin.customization.enableEmojiPickerTitle": "Enable Emoji Picker:",
  "admin.customization.enableGifPickerDesc": "Allow users to select GIFs from the emoji picker via a Gfycat integration.",
  "admin.customization.enableGifPickerTitle": "Enable GIF Picker:",
- "admin.customization.enableLinkPreviewsDesc": "Display a preview of website content below messages, when available. Users can disable these previews from Account Settings > Display > Website Link Previews.",
+ "admin.customization.enableLinkPreviewsDesc": "Display a preview of website content below messages, when available. Users can disable these previews from Account Settings > Display > Website Link Previews. This setting only applies to websites with OpenGraph metadata and not for image links or YouTube previews.",
  "admin.customization.enableLinkPreviewsTitle": "Enable Link Previews:",
  "admin.customization.gfycatApiKey": "Gfycat API Key:",
  "admin.customization.gfycatApiKeyDescription": "Request an API key at [https://developers.gfycat.com/signup/#](!https://developers.gfycat.com/signup/#). Enter the client ID you receive via email to this field. When blank, uses the default API key provided by Gfycat.",