The L10n bot change https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Graph/+/995151 had to be manually merged because the message translation included a <graph> tag, which is unrecognized by Jenkins job configuration:
[mediawiki-i18n-check-docker] $ /bin/bash /tmp/jenkins1542011854923282206.sh + cd src ++ pwd + git config --global --add safe.directory /srv/jenkins/workspace/mediawiki-i18n-check-docker/src ++ mktemp + additions=/tmp/tmp.sxNPtYvt86 + git show FETCH_HEAD -U0 + grep '^+' + contains_disallowed_html /tmp/tmp.sxNPtYvt86 + cat /tmp/tmp.sxNPtYvt86 + sed -E -e 's/<\/? ?(abbr|span|br|strong|em|pre|nowiki|charinsert|b|del|code|kbd|p|tt|div|i|big|sup|sub|samp|var|small|h1|h2|h3|h4|u|ol|ul|li|mark|user|page|hr|templatestyles|NDL|math|syntaxhighlight|templatedata|pagelist|bdi|ref|dd|dl)( ((class|title|lang|xml:lang|dir|xmlns|display|alttext)=\\?["'\''][^=<>"'\'']*\\?["'\'']))* ?\/?>//g' -e 's/<!--//g' -e 's/<https?:\/\/[a-zA-Z0-9./-]*>//g' + grep '<' + "graph-tracking-category-desc": "Síðan innifelur <graph>-merki.", + "graph-broken-category-desc": "Síðan innifelur <graph>-merki með ógildri notkun.", + "graph-obsolete-category-desc": "Síðan innifelur <graph>-merki sem ætti að uppfæra á útgáfu 5.", + echo 'HTML detected. Manual review required' HTML detected. Manual review required
The easy solution appears to be to replace <code><nowiki><graph></nowiki></code> with <graph>, which was already done in another message.