The webapp provides for each item the link on ECB's website.
Speeches for : Yves Mersch where "changed" appeared
2019-02-04 : The changing role of central banking2017-07-25 : The ECB’s monetary policy stance
2016-02-02 : Interview with Wall Street Journal
2015-12-29 : Interview with International Bankers Forum
2015-06-04 : Getting the balance right: innovation, trust and regulation in retail payments