Changes
use #titleparts instead
{{#ifeq:{{SUBPAGENAME#titleparts:{{FULLPAGENAME}}|1|-1}}|{{#language:{{SUBPAGENAME#titleparts:{{FULLPAGENAME}}|1|-1}}}}<!--
-->|{{ {{{1}}} }}<!--
-->|{{#ifexist:Template:{{{1}}}/{{SUBPAGENAME#titleparts:{{FULLPAGENAME}}|1|-1}}<!-- -->|{{ {{{1}}}/{{SUBPAGENAME#titleparts:{{FULLPAGENAME}}|1|-1}} }}<!--
-->|{{ {{{1}}}/en }}<!--
-->}}<!--