Problem changing tabs component!

so, i needed something like android studio Guided flow but i couldn’t find anything close.


so i did it myself with js and css and changing tab-botton.js in tabs module folder.
changes are applied and working fine in browser(ionic serve) and android debug mode. but when i use --prod to release the app the template changes are gone and the original markup shows!
my only change was changing the tamplate in that file from this:

template: '<ion-icon *ngIf="tab.tabIcon" [name]="tab.tabIcon" [isActive]="tab.isSelected" class="tab-button-icon"></ion-icon>' +
                            '<span *ngIf="tab.tabTitle" class="tab-button-text">{{tab.tabTitle}}</span>' +
                            '<ion-badge *ngIf="tab.tabBadge" class="tab-badge" [color]="tab.tabBadgeStyle">{{tab.tabBadge}}</ion-badge>' +
                            '<div class="button-effect"></div>'

to this:

template: '<ion-icon *ngIf="tab.tabIcon" [name]="tab.tabIcon" [isActive]="tab.isSelected" class="tab-button-icon"></ion-icon>' +
                        '<div class="big-circle"></div><div #tabBtnBox class="tab-btn-box"><span *ngIf="tab.tabTitle" class="tab-button-text">{{tab.tabTitle}}</span></div>' +
                        '<ion-badge *ngIf="tab.tabBadge" class="tab-badge" [color]="tab.tabBadgeStyle">{{tab.tabBadge}}</ion-badge>' +
                        '<div class="button-effect"></div>'

i really need this… can someone help please?