diff --git a/frontend/static/js/library.js b/frontend/static/js/library.js
index b4429cc..01bb3d3 100644
--- a/frontend/static/js/library.js
+++ b/frontend/static/js/library.js
@@ -35,17 +35,6 @@ function getSorting(type, key=false) {
 		return getLocalStorage(sorting_key)[sorting_key];
 };
 
-function getWeekDays(locale) {
-	const baseDate = new Date(Date.UTC(2017, 0, 2)); // just a Monday
-	const weekDays = [];
-	for (i = 0; i < 7; i++)
-	{
-		weekDays.push(baseDate.toLocaleDateString(locale, { weekday: 'short' }));
-		baseDate.setDate(baseDate.getDate() + 1);
-	}
-	return weekDays;
-};
-
 function getActiveTab() {
 	for (let t of Object.values(Types)) {
 		if (getComputedStyle(t).display === 'flex')
@@ -159,7 +148,7 @@ function evaluateSizing() {
 Object.values(Types).forEach(t => fillLibrary(t));
 setInterval(() => fillLibrary(Types.reminder), 60000);
 
-const week_days = getWeekDays(getLocalStorage('locale')['locale']);
+const week_days = ["Mo", "Tu", "We", "Thu", "Fr", "Sa", "Su"];
 
 NavButtons.home.onclick = e => showWindow("home");
 NavButtons.notification_services.onclick = e => showWindow("notification");
diff --git a/frontend/static/js/notification.js b/frontend/static/js/notification.js
index 8c28b96..1f28172 100644
--- a/frontend/static/js/notification.js
+++ b/frontend/static/js/notification.js
@@ -545,11 +545,15 @@ function testService() {
 
 	const faulty_inputs =
 		[...NotiEls.add_service_window.querySelectorAll('input:not([data-regex=""])[data-regex]')]
-			.filter(el => !new RegExp
-				(
-					el.dataset.regex.split(',').slice(0, el.dataset.regex.split(',').length-1).join(','),
-					el.dataset.regex.split(',')[el.dataset.regex.split(',').length-1]
-				).test(el.value)
+			.filter(el =>
+				!(
+					(!el.required && el.value === '')
+					||
+					new RegExp(
+						el.dataset.regex.split(',').slice(0, el.dataset.regex.split(',').length-1).join(','),
+						el.dataset.regex.split(',')[el.dataset.regex.split(',').length-1]
+					).test(el.value)
+				)
 			);
 	if (faulty_inputs.length > 0) {
 		faulty_inputs.forEach(el => el.classList.add('error-input'));