ui: branch list: use the new Compare language when available

When viewing the branch listing as an unauthenticated user, you'll get
"Pull Request" buttons. use the new "Compare" verbiage instead, which
matches GitHub behavior when you can't issue a pull request from the
branches.

routers/repo/branch.go

@@ -46,6 +46,7 @@ func Branches(ctx *context.Context) {
  ctx.Data["AllowsPulls"] = ctx.Repo.Repository.AllowsPulls()
  ctx.Data["IsWriter"] = ctx.Repo.CanWrite(models.UnitTypeCode)
  ctx.Data["IsMirror"] = ctx.Repo.Repository.IsMirror
+ ctx.Data["CanPull"] = ctx.Repo.CanWrite(models.UnitTypeCode) || (ctx.IsSigned && ctx.User.HasForkedRepo(ctx.Repo.Repository.ID))
  ctx.Data["PageIsViewCode"] = true
  ctx.Data["PageIsBranches"] = true
 

templates/repo/branch/list.tmpl

@@ -81,13 +81,13 @@
  </a>
  {{else if and (not .IsDeleted) $.AllowsPulls (gt .CommitsAhead 0)}}
  <a href="{{$.RepoLink}}/compare/{{$.DefaultBranch | EscapePound}}...{{if ne $.Repository.Owner.Name $.Owner.Name}}{{$.Owner.Name}}:{{end}}{{.Name | EscapePound}}">
- <button id="new-pull-request" class="ui compact basic button">{{$.i18n.Tr "repo.pulls.compare_changes"}}</button>
+ <button id="new-pull-request" class="ui compact basic button">{{if $.CanPull}}{{$.i18n.Tr "repo.pulls.compare_changes"}}{{else}}{{$.i18n.Tr "action.compare_branch"}}{{end}}</button>
  </a>
  {{end}}
  {{else if and .LatestPullRequest.HasMerged .MergeMovedOn}}
  {{if and (not .IsDeleted) $.AllowsPulls (gt .CommitsAhead 0)}}
  <a href="{{$.RepoLink}}/compare/{{$.DefaultBranch | EscapePound}}...{{if ne $.Repository.Owner.Name $.Owner.Name}}{{$.Owner.Name}}:{{end}}{{.Name | EscapePound}}">
- <button id="new-pull-request" class="ui compact basic button">{{$.i18n.Tr "repo.pulls.compare_changes"}}</button>
+ <button id="new-pull-request" class="ui compact basic button">{{if $.CanPull}}{{$.i18n.Tr "repo.pulls.compare_changes"}}{{else}}{{$.i18n.Tr "action.compare_branch"}}{{end}}</button>
  </a>
  {{end}}
  {{else}}