Cleanup: remove TrackUtils by inlining functionality.

src/main/java/de/dennisguse/opentracks/data/models/ActivityType.java

@@ -129,10 +129,12 @@ public enum ActivityType {
                 .orElse(ActivityType.UNKNOWN);
     }
 
+    @NonNull
     public static ActivityType findByLocalizedString(Context context, String localizedActivityType) {
         return findByLocalizedString(context.getResources(), localizedActivityType);
     }
 
+    @NonNull
     public static ActivityType findByLocalizedString(Resources resources, String localizedActivityType) {
         return Arrays.stream(ActivityType.values())
                 .filter(it -> resources.getString(it.getLocalizedStringId()).equals(localizedActivityType))

src/main/java/de/dennisguse/opentracks/data/models/Track.java

@@ -16,6 +16,7 @@
 
 package de.dennisguse.opentracks.data.models;
 
+import android.content.Context;
 import android.os.Parcel;
 import android.os.Parcelable;
 
@@ -113,6 +114,11 @@ public class Track {
         this.activityType = activityType;
     }
 
+    public void setActivityTypeLocalizedAndUpdateActivityType(Context context, String activityTypeLocalized) {
+        setActivityTypeLocalized(activityTypeLocalized);
+        setActivityType(ActivityType.findByLocalizedString(context, activityTypeLocalized));
+    }
+
     public ZoneOffset getZoneOffset() {
         return zoneOffset;
     }