Improve Bit Rate translate processing

dashboard/src/app/artist/artist.component.html

@@ -111,7 +111,7 @@
           <td>{{song['Play Count']}}</td>
           <td><a [routerLink]="['/genre', song.Genre]">{{song.Genre}}</a></td>
           <td [title]="song['Bit Rate']">
-              <span [class]="'signal signal-' + Math.round(song['Bit Rate']/64)"></span>
+              <span [class]="'signal signal-' + roundBitRate(song['Bit Rate'])"></span>
             </td>
           <td *ngIf="!song['Rating Computed']" [title]="'Rating: ' + song.Rating" class="star">
               <span *ngIf="song.Rating >= 20" class="glyphicon glyphicon-star"></span>

dashboard/src/app/artist/artist.component.ts

@@ -15,7 +15,6 @@ import { SortByPipe } from './../sort-by.pipe';
 })
 
 export class ArtistComponent implements OnInit {
-  Math: any;
   artistName = '';
   songs: Array<Song> = [];
   artist: Artist = new Artist();
@@ -30,9 +29,7 @@ export class ArtistComponent implements OnInit {
     private elsService: ElsService,
     private route: ActivatedRoute,
     private location: Location
-  ) {
-    this.Math = Math;
-  }
+  ) { }
 
   ngOnInit(): void {
     this.route.params.subscribe((params: Params) => this.artistName = params['name']);
@@ -99,4 +96,8 @@ export class ArtistComponent implements OnInit {
     this.songs = new SortByPipe().transform(this.songs, 'Year', 'Album', 'Track Number', 'Play Count');
     this.sortable = false;
   }
+
+  roundBitRate(bitRate: number) {
+    return Math.round(bitRate / 64);
+  }
 }