PLT-7468 Moved more error pages to use predefined error types (#7378)

* PLT-7468 Moved more errors to use error types

* PLT-7468 Moved 404 error page to use error types

* Made helper function for rendering external links on error page

api4/user.go

@@ -244,7 +244,7 @@ func setProfileImage(c *Context, w http.ResponseWriter, r *http.Request) {
 	}
 
 	if err := r.ParseMultipartForm(*utils.Cfg.FileSettings.MaxFileSize); err != nil {
-		c.Err = model.NewAppError("uploadProfileImage", "api.user.upload_profile_user.parse.app_error", nil, "", http.StatusInternalServerError)
+		c.Err = model.NewAppError("uploadProfileImage", "api.user.upload_profile_user.parse.app_error", nil, err.Error(), http.StatusInternalServerError)
 		return
 	}