Comment # 2 on bug 1214835 from Stephan Hemeier

The new -lang packages are using another name:

zypper se -sC WebKit2GTK- WebKitGTK-
Repository-Daten werden geladen...
Installierte Pakete werden gelesen...

S  | Name                | Type  | Version              | Arch   | Repository
---+---------------------+-------+----------------------+--------+-------------------------------------------------------------
   | WebKit2GTK-4.0-lang | Paket | 2.38.6-150400.4.42.4 | noarch | Update
repository with updates from SUSE Linux Enterprise 15
   | WebKit2GTK-4.0-lang | Paket | 2.38.6-150400.4.39.1 | noarch | Main
Repository
   | WebKit2GTK-4.1-lang | Paket | 2.38.6-150400.4.42.4 | noarch | Update
repository with updates from SUSE Linux Enterprise 15
   | WebKit2GTK-4.1-lang | Paket | 2.38.6-150400.4.39.1 | noarch | Main
Repository
i+ | WebKit2GTK-5.0-lang | Paket | 2.38.6-150400.4.42.4 | noarch | Update
repository with updates from SUSE Linux Enterprise 15
v  | WebKit2GTK-5.0-lang | Paket | 2.38.6-150400.4.39.1 | noarch | Main
Repository
i+ | WebKitGTK-4.0-lang  | Paket | 2.40.5-150400.4.45.3 | noarch | Update
repository with updates from SUSE Linux Enterprise 15
i+ | WebKitGTK-4.1-lang  | Paket | 2.40.5-150400.4.45.3 | noarch | Update
repository with updates from SUSE Linux Enterprise 15
i+ | WebKitGTK-6.0-lang  | Paket | 2.40.5-150400.4.45.3 | noarch | Update
repository with updates from SUSE Linux Enterprise 15