Improve layout for entering weight

MyTracks/res/layout/choose_activity_type.xml

@@ -32,11 +32,12 @@ limitations under the License.
     android:layout_width="match_parent"
     android:orientation="vertical" >
     <TextView
+      android:id="@+id/choose_activity_type_weight_label"
       android:layout_marginBottom="2dp"
       android:layout_marginLeft="16dp"
       android:layout_marginRight="16dp"
       android:layout_marginTop="4dp"
-      android:text="@string/settings_stats_weight"
+      android:paddingLeft="12dp"
       style="@style/TextMedium" />
     <EditText
       android:id="@+id/choose_activity_type_weight"

MyTracks/res/values/strings.xml

@@ -555,7 +555,15 @@ limitations under the License.
     translation_description="Label for a track segment">
     Segment
   </string>
-
+  <string name="description_weight_imperial"
+    translation_description="Label for weight in pounds.">
+    Weight (lb)
+  </string>
+  <string name="description_weight_metric"
+    translation_description="Label for weight in kilograms.">
+    Weight (kg)
+  </string>
+  
   <!-- Eula -->
   <string name="eula_accept"
     translation_description="In the 'Terms of Service' dialog, the button to accept.">