minor symfony#46578 Improve DE translations for Form/Validator (sandoba)

This PR was squashed before being merged into the 4.4 branch.

Discussion
----------

Improve DE translations for Form/Validator

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | none
| License       | MIT
| Doc PR        | not needed

A few changes to the German translations of the Form and Validator components.

Commits
-------

8989377 Improve DE translations for Form/Validator

Author: fabpot

src/Symfony/Component/Form/Resources/translations/validators.de.xlf

@@ -12,7 +12,7 @@
             </trans-unit>
             <trans-unit id="30">
                 <source>The CSRF token is invalid. Please try to resubmit the form.</source>
-                <target>Der CSRF-Token ist ungültig. Versuchen Sie bitte das Formular erneut zu senden.</target>
+                <target>Der CSRF-Token ist ungültig. Versuchen Sie bitte, das Formular erneut zu senden.</target>
             </trans-unit>
             <trans-unit id="99">
                 <source>This value is not a valid HTML5 color.</source>

src/Symfony/Component/Validator/Resources/translations/validators.de.xlf

@@ -220,7 +220,7 @@
             </trans-unit>
             <trans-unit id="58">
                 <source>Unsupported card type or invalid card number.</source>
-                <target>Nicht unterstützer Kartentyp oder ungültige Kartennummer.</target>
+                <target>Nicht unterstützter Kartentyp oder ungültige Kartennummer.</target>
             </trans-unit>
             <trans-unit id="59">
                 <source>This is not a valid International Bank Account Number (IBAN).</source>
@@ -312,7 +312,7 @@
             </trans-unit>
             <trans-unit id="81">
                 <source>This is not a valid Business Identifier Code (BIC).</source>
-                <target>Dieser Wert ist kein gültiger BIC.</target>
+                <target>Dieser Wert ist keine gültige internationale Bankleitzahl (BIC).</target>
             </trans-unit>
             <trans-unit id="82">
                 <source>Error</source>