Fix collection rendering in Chorus mode

collections.go

@@ -582,6 +582,9 @@ type CollectionPage struct {
 	PinnedPosts    *[]PublicPost
 	IsAdmin        bool
 	CanInvite      bool
+
+	// Helper field for Chorus mode
+	CollAlias string
 }
 
 func NewCollectionObj(c *Collection) *CollectionObj {
@@ -818,6 +821,7 @@ func handleViewCollection(app *App, w http.ResponseWriter, r *http.Request) erro
 		StaticPage:        pageForReq(app, r),
 		IsCustomDomain:    cr.isCustomDomain,
 		IsWelcome:         r.FormValue("greeting") != "",
+		CollAlias:         c.Alias,
 	}
 	displayPage.IsAdmin = u != nil && u.IsAdmin()
 	displayPage.CanInvite = canUserInvite(app.cfg, displayPage.IsAdmin)

posts.go

@@ -144,6 +144,9 @@ type (
 		IsAdmin        bool
 		CanInvite      bool
 		Silenced       bool
+
+		// Helper field for Chorus mode
+		CollAlias string
 	}
 
 	RawPost struct {
@@ -1536,6 +1539,7 @@ Are you sure it was ever here?`,
 			IsCustomDomain: cr.isCustomDomain,
 			IsFound:        postFound,
 			Silenced:       silenced,
+			CollAlias:      c.Alias,
 		}
 		tp.IsAdmin = u != nil && u.IsAdmin()
 		tp.CanInvite = canUserInvite(app.cfg, tp.IsAdmin)
@@ -1551,7 +1555,7 @@ Are you sure it was ever here?`,
 			postTmpl = "chorus-collection-post"
 		}
 		if err := templates[postTmpl].ExecuteTemplate(w, "post", tp); err != nil {
-			log.Error("Error in collection-post template: %v", err)
+			log.Error("Error in %s template: %v", postTmpl, err)
 		}
 	}