Task/improve language localization for DE (20260708) (#7276)

Update translations

apps/client/src/locales/messages.de.xlf

@@ -1435,7 +1435,7 @@
       </trans-unit>
       <trans-unit id="4037247308022519888" datatype="html">
         <source>The value has been copied to the clipboard</source>
-        <target state="new">The value has been copied to the clipboard</target>
+        <target state="translated">Der Wert wurde in die Zwischenablage kopiert</target>
         <context-group purpose="location">
           <context context-type="sourcefile">libs/ui/src/lib/notifications/alert-dialog/alert-dialog.component.ts</context>
           <context context-type="linenumber">46</context>
@@ -1519,7 +1519,7 @@
       </trans-unit>
       <trans-unit id="4323470180912194028" datatype="html">
         <source>Copy</source>
-        <target state="new">Copy</target>
+        <target state="translated">Kopieren</target>
         <context-group purpose="location">
           <context context-type="sourcefile">libs/ui/src/lib/notifications/alert-dialog/alert-dialog.html</context>
           <context context-type="linenumber">20</context>
@@ -2895,7 +2895,7 @@
       </trans-unit>
       <trans-unit id="8664947843178872012" datatype="html">
         <source>Close Account</source>
-        <target state="new">Close Account</target>
+        <target state="translated">Konto schliessen</target>
         <context-group purpose="location">
           <context context-type="sourcefile">apps/client/src/app/components/user-account-settings/user-account-settings.html</context>
           <context context-type="linenumber">337</context>
@@ -4423,7 +4423,7 @@
       </trans-unit>
       <trans-unit id="4489207161748215824" datatype="html">
         <source>For security reasons, please delete all activities and accounts first before your Ghostfolio account can be closed.</source>
-        <target state="new">For security reasons, please delete all activities and accounts first before your Ghostfolio account can be closed.</target>
+        <target state="translated">Bitte lösche aus Sicherheitsgründen zuerst alle Aktivitäten und Konten, bevor dein Ghostfolio Konto geschlossen werden kann.</target>
         <context-group purpose="location">
           <context context-type="sourcefile">apps/client/src/app/components/user-account-settings/user-account-settings.html</context>
           <context context-type="linenumber">348</context>