[Bug translation/90160] missing quote in diagnostic

[roland.illig at gmx dot de via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90160

--- Comment #12 from Roland Illig <roland.illig at gmx dot de> ---
Thank you for your fixes, they all look good to me. Looking forward to
translating GCC 15 into German.