login [nfc]: Replace loginForm with more explicit loginContent

Author: MritunjayTiwari14

lib/generated/l10n/zulip_localizations.dart

@@ -1179,7 +1179,7 @@ abstract class ZulipLocalizations {
   /// **'OR'**
   String get loginMethodDivider;
 
-  /// Semantic label for alternative login options separating line in login page.
+  /// Semantic label for divider between the username/password form and the third-party login options.
   ///
   /// In en, this message translates to:
   /// **'Log-in alternatives'**

lib/widgets/login.dart

@@ -457,7 +457,7 @@ class _LoginPageState extends State<LoginPage> {
 
     final externalAuthenticationMethods = widget.serverSettings.externalAuthenticationMethods;
 
-    final loginForm = Column(mainAxisAlignment: MainAxisAlignment.center, children: [
+    final loginContent = Column(mainAxisAlignment: MainAxisAlignment.center, children: [
       _UsernamePasswordForm(loginPageState: this),
       if (externalAuthenticationMethods.isNotEmpty) ...[
         const OrDivider(),
@@ -497,7 +497,7 @@ class _LoginPageState extends State<LoginPage> {
               //   left or the right of this box
               child: ConstrainedBox(
                 constraints: const BoxConstraints(maxWidth: 400),
-                child: loginForm))))));
+                child: loginContent))))));
   }
 }