Bug 1641354 - Need to add localisation notes to some entities in brand.properties. r=frg

suite/branding/seamonkey/locales/en-US/brand.properties

@@ -7,6 +7,15 @@ brandShortName=SeaMonkey
 brandShorterName=SeaMonkey
 vendorShortName=SeaMonkey e.V.
 sidebarName=Sidebar
+
+# Only change these links if you are providing a localized website including
+# release notes.
+# LOCALIZATION NOTE (app.releaseNotesURL): Only translate this string if
+# providing a localized version of the release notes.
 app.releaseNotesURL=https://www.seamonkey-project.org/releases/seamonkey%VERSION%/
+# LOCALIZATION NOTE (app.troubleshootingURL): Only translate this string if
+# providing a localized version of the release notes.
 app.troubleshootingURL=https://www.seamonkey-project.org/releases/seamonkey%VERSION%/#troubleshooting
+# LOCALIZATION NOTE (app.vendorURL): Only translate this string if
+# providing a localized version of the SeaMonkey website.
 app.vendorURL=https://www.seamonkey-project.org/