feat: theme error page #1340

Job	Run time
changes	7s
integration-sqlite (capabilities_features, 8.2, main)	4m 4s
integration-sqlite (collaboration_features, 8.2, main)	5m 54s
integration-sqlite (comments_features, 8.2, main)	4m 52s
integration-sqlite (dav_features, 8.2, main)	10m 42s
integration-sqlite (features, 8.2, main)	5m 40s
integration-sqlite (federation_features, 8.2, main)	7m 6s
integration-sqlite (--tags ~@large files_features, 8.2, main)	15m 30s
integration-sqlite (filesdrop_features, 8.2, main)	3m 27s
integration-sqlite (openldap_features, 8.2, main)	59s
integration-sqlite (openldap_numerical_features, 8.2, main)	1m 2s
integration-sqlite (ldap_features, 8.2, main)	4m 26s
integration-sqlite (remoteapi_features, 8.2, main)	3m 42s
integration-sqlite (setup_features, 8.2, main)	3m 32s
integration-sqlite (sharees_features, 8.2, main)	2m 32s
integration-sqlite (sharing_features, 8.2, main)	15m 10s
integration-sqlite (videoverification_features, 8.2, main)	6m 42s
integration-sqlite-summary	4s
	1h 35m 31s

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