fix: unbreak rendering of a global error message in browsers other than Firefox

Replace Mozilla-specific event.originalTarget by widely available event.target property.

Correction for 6315235 commit.

Relate to #1671

[skip ci]

Author: php-coder

src/main/webapp/WEB-INF/views/series/info.html

@@ -1053,7 +1053,7 @@ <h5 th:text="#{t_add_info_who_selling_series}">Add info about selling/buying thi
 					event.detail.isError = false;
 				
 				} else if (event.detail.xhr.status !== 200) {
-					var errorMessage = event.originalTarget.querySelector('.server-error-msg');
+					var errorMessage = event.target.querySelector('.server-error-msg');
 					if (errorMessage != null) {
 						errorMessage.classList.remove('hidden');
 					} else {