Improve semester selection in home sidebar (#1139)

Adds /20xx to all winter semesters in the semester selection sidebar.
Also increases bottom margin on the currently selected semester.

web/template/home.gohtml

@@ -150,7 +150,7 @@
                 <i class="fa-solid fa-calendar"></i>
                 Semesters
             </header>
-            <span class="tum-live-side-navigation-group-item mb-1 border-l-4 bg-blue-100/50 border-blue-500/50 dark:bg-indigo-500/25 dark:border-indigo-600/50"
+            <span class="tum-live-side-navigation-group-item mb-4 border-l-4 bg-blue-100/50 border-blue-500/50 dark:bg-indigo-500/25 dark:border-indigo-600/50"
                   x-text="semesters[selectedSemesterIndex]?.FriendlyString()"></span>
             <template x-if="navigation.getChild('allSemesters').value">
                 <template x-for="s in semesters">
@@ -832,4 +832,4 @@
             </div>
         </div>
     </div>
-{{end}}
+{{end}}

web/ts/api/semesters.ts

@@ -15,7 +15,8 @@ export class Semester {
     }
 
     public FriendlyString(): string {
-        return `${this.TeachingTerm === "W" ? "Winter" : "Summer"} ${this.Year}`;
+        if (this.TeachingTerm === "W") return `Winter ${this.Year}/` + `${this.Year + 1}`.slice(-2);
+        else return `Summer ${this.Year}`;
     }
 }