Add nautical miles (with feet for altitude).

Tests were broken.

Fixes #1280.

src/androidTest/java/de/dennisguse/opentracks/chart/ChartValueSeriesTest.java

@@ -47,6 +47,7 @@ public class ChartValueSeriesTest {
                 new int[]{1, 100, 1000},
                 R.string.description_altitude_metric,
                 R.string.description_altitude_imperial,
+                R.string.description_altitude_imperial,
                 R.color.chart_altitude_fill,
                 R.color.chart_altitude_border,
                 15,

src/androidTest/java/de/dennisguse/opentracks/data/models/DistanceFormatterTest.java

@@ -54,6 +54,6 @@ public class DistanceFormatterTest {
         // A large number in nautical
         assertEquals("2.70 NM", formatter.formatDistance(Distance.of(5000)));
         // A small number in nautical
-        assertEquals("0.05 NM", formatter.formatDistance(Distance.of(100)));
+        assertEquals("328.08 ft", formatter.formatDistance(Distance.of(100)));
     }
 }

src/androidTest/java/de/dennisguse/opentracks/data/models/SpeedFormatterTest.java

@@ -89,7 +89,7 @@ public class SpeedFormatterTest {
                 .build(context);
 
         assertEquals("6.5", formatter.getSpeedParts(Speed.of(3.34)).first);
-        assertEquals("knots", formatter.getSpeedParts(Speed.zero()).second);
+        assertEquals("kn", formatter.getSpeedParts(Speed.zero()).second);
     }
 
     @Test