templates/repo/issue: escape delete branch link after merged pull request (#4601)
templates/repo/issue: escape delete branch link after merged pull request (#4601)

chriswatt/gogs,gogits/gogs,mukaiu/gogs,mukaiu/gogs,gogits/gogs,mukaiu/gogs,chriswatt/gogs,chriswatt/gogs,gogits/gogs