Weak dependency should be on langpacks-.. (with "s")
<jsilhan> hi, there is the example:
<jsilhan> https://fedoraproject.org/wiki/PackagingDrafts/Langpack
<jsilhan> it shoudl be Supplements: (glibc = %{version}-%{release} and
langpacks-%{1}
<jsilhan> and the package name is `glibc-cs`