commands: Add --lang to hugo config

Fixes #11057

config/allconfig/allconfig.go

@@ -664,6 +664,11 @@ func (c *Configs) Init() error {
 		}
 	}
 
+	// Transfer the changed mounts to the language versions (all share the same mount set, but can be displayed in different languages).
+	for _, l := range c.LanguageConfigSlice {
+		l.Module.Mounts = c.Base.Module.Mounts
+	}
+
 	return nil
 }
 

config/allconfig/integration_test.go

@@ -60,7 +60,7 @@ Title: {{ .Title }}
 
 	b.Assert(enConcp.BaseURL().String(), qt.Equals, "https://example.com")
 	modConf := enConf.Module
-	b.Assert(modConf.Mounts, qt.HasLen, 2)
+	b.Assert(modConf.Mounts, qt.HasLen, 8)
 	b.Assert(modConf.Mounts[0].Source, qt.Equals, filepath.FromSlash("content/en"))
 	b.Assert(modConf.Mounts[0].Target, qt.Equals, "content")
 	b.Assert(modConf.Mounts[0].Lang, qt.Equals, "en")