Using Umlauts in Filter Name leads to Database Error

Problem/Motivation

Using Umlauts in Filter Name leads to Database Error.

Steps to reproduce

Add german umlauts like "äöü" in the title of any filter leads to an error in the AJAX saving call. Here is the complete error log message:

Drupal\Core\Database\DatabaseExceptionWrapper: SQLSTATE[22007]: Invalid datetime format: 1366 Incorrect string value: '\xC3\xA4\xC3\xB6\xC3\xBC' for column `c1m`.`views_save_search_filter`.`filter_title` at row 1: INSERT INTO "views_save_search_filter" ("filter_title", "filter_url", "view_id", "user_id", "username", "created") VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5); Array ( [:db_insert_placeholder_0] => äöü

Proposed resolution

Encode umlauts or other special characters correctly.