[TASK] Mitigate Browser "Spell-Jacking" in additional form elements

Disables spell checking in additional form elements:
* Setup Module `<form>` element
* ext:felogin `<form onsubmit>` element

See issue #98492 for details.

Resolves: #98504
Related: #98492
Releases: main
Change-Id: Ib3c7b39d05f1c2baed173ab506666e3661cbb519
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75945
Tested-by: core-ci <typo3@b13.com>
Tested-by: Kevin Appelt <kevin.appelt@icloud.com>
Tested-by: Torben Hansen <derhansen@gmail.com>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Kevin Appelt <kevin.appelt@icloud.com>
Reviewed-by: Torben Hansen <derhansen@gmail.com>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>

typo3/sysext/felogin/Resources/Private/Templates/Login/Login.html

@@ -15,7 +15,7 @@ <h3>
 </f:if>
 <f:if condition="{onSubmit}">
     <f:then>
-        <f:form target="_top" fieldNamePrefix="" action="login" onsubmit="{onSubmit}" requestToken="{requestToken}">
+        <f:form target="_top" fieldNamePrefix="" action="login" onsubmit="{onSubmit}" requestToken="{requestToken}" additionalAttributes="{spellcheck: 'false'}">
             <f:render section="content" arguments="{_all}"/>
         </f:form>
     </f:then>

typo3/sysext/setup/Resources/Private/Templates/Main.html

@@ -24,6 +24,7 @@
         id="SetupModuleController"
         name="usersetup"
         enctype="multipart/form-data"
+        spellcheck="false"
     >
         <div id="user-setup-wrapper">
             <h1>