Localizing search box strings, channel tags

fixes #3124
fixes #3128
fixes #3083

frontend/src/app/lightning/channel/closing-type/closing-type.component.ts

@@ -17,19 +17,19 @@ export class ClosingTypeComponent implements OnChanges {
   getLabelFromType(type: number): { label: string; class: string } {
     switch (type) {
       case 1: return { 
-        label: 'Mutually closed',
+        label: $localize`Mutually closed`,
         class: 'success',
       };
       case 2: return {
-        label: 'Force closed',
+        label: $localize`Force closed`,
         class: 'warning',
       };
       case 3: return {
-        label: 'Force closed with penalty',
+        label: $localize`Force closed with penalty`,
         class: 'danger',
       };
       default: return {
-        label: 'Unknown',
+        label: $localize`:@@e5d8bb389c702588877f039d72178f219453a72d:Unknown`,
         class: 'secondary',
       };
     }

frontend/src/app/lightning/channels-statistics/channels-statistics.component.html

@@ -1,9 +1,9 @@
 <div class="widget-toggler">
   <a href="" (click)="switchMode('avg')" class="toggler-option"
-    [ngClass]="{'inactive': mode === 'avg'}"><small>avg</small></a>
+    [ngClass]="{'inactive': mode === 'avg'}"><small i18n="statistics.average-small">avg</small></a>
   <span style="color: #ffffff66; font-size: 8px"> | </span>
   <a href="" (click)="switchMode('med')" class="toggler-option"
-    [ngClass]="{'inactive': mode === 'med'}"><small>med</small></a>
+    [ngClass]="{'inactive': mode === 'med'}"><small i18n="statistics.median-small">med</small></a>
 </div>
 
 <div class="fee-estimation-wrapper" *ngIf="statistics$ | async as statistics; else loadingReward">