Enable to edit timezone offset for recorded tracks.

Fixes #2014.

src/main/res/layout/track_edit.xml

@@ -79,6 +79,25 @@ limitations under the License.
                         android:layout_gravity="bottom" />
                 </LinearLayout>
 
+                <com.google.android.material.textfield.TextInputLayout
+                    style="?attr/textInputOutlinedExposedDropdownMenuStyle"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_marginBottom="16dp"
+                    android:imeOptions="actionNext"
+                    android:importantForAutofill="no">
+
+                    <com.google.android.material.textfield.MaterialAutoCompleteTextView
+                        android:id="@+id/track_edit_time_offset"
+                        android:layout_width="match_parent"
+                        android:inputType="none"
+                        android:layout_height="wrap_content"
+                        android:layout_marginEnd="8dp"
+                        android:hint="@string/track_edit_time_offset"
+                        android:imeOptions="actionNext"
+                        android:selectAllOnFocus="true" />
+                </com.google.android.material.textfield.TextInputLayout>
+
                 <com.google.android.material.textfield.TextInputLayout
                     style="?attr/textInputOutlinedStyle"
                     android:layout_width="match_parent"

src/main/res/values/strings.xml

@@ -491,6 +491,7 @@ limitations under the License.
     <!-- Track Edit -->
     <string name="track_edit_activity_type">Activity type (e.g. hiking)</string>
     <string name="track_edit_activity_type_hint">Activity type</string>
+    <string name="track_edit_time_offset">Timezone Offset</string>
     <!-- Track List -->
     <string name="track_list_empty_message">Start recording your next adventure here</string>
     <!-- Aggregated Statistics -->