linter fixes

landingpage/index.html

@@ -53,7 +53,7 @@
                 <h2>Introduction</h2>
                 <div class="info-article info-article--video highlighted">
                     <div class="info-article__media">
-                        <iframe class="info-article__media--youtube" src="https://www.youtube.com/embed/6LOnEMBuW0I"></iframe>
+                        <iframe class="info-article__media--youtube" src="https://www.youtube.com/embed/6LOnEMBuW0I" title="PlanIt: Projekt Bachelor-Studium Kommunikation und Medien (Informatik, Darmstadt)"></iframe>
                     </div>
                 </div>
                 <div class="info-article info-article--text">
@@ -85,12 +85,12 @@
                 </div>
                 <div class="info-article info-article--video highlighted">
                     <div class="info-article__media">
-                        <iframe class="info-article__media--youtube" src="https://www.youtube.com/embed/7-zvaghwb6M"></iframe>
+                        <iframe class="info-article__media--youtube" src="https://www.youtube.com/embed/7-zvaghwb6M" title="MyCO2: Projekt Bachelor-Studium Kommunikation und Medien (Informatik, Darmstadt)"></iframe>
                     </div>
                 </div>
                 <div class="info-article info-article--video highlighted">
                     <div class="info-article__media">
-                        <iframe class="info-article__media--youtube" src="https://www.youtube.com/embed/OEgASTpkwmw"></iframe>
+                        <iframe class="info-article__media--youtube" src="https://www.youtube.com/embed/OEgASTpkwmw" title="Studieninhalte Kommunikation und Medien KMI (Informatik, Darmstadt)"></iframe>
                     </div>
                 </div>
                 <div class="info-article info-article--text">