refactor: replace save with send string

app/src/main/java/com/geeksville/mesh/ui/MapFragment.kt

@@ -578,7 +578,7 @@ class MapFragment : ScreenFragment("Map Fragment"), Logging, View.OnClickListene
                     .setNeutralButton(R.string.cancel) { _, _ ->
                         debug("User canceled marker create dialog")
                     }
-                    .setPositiveButton(getString(R.string.save)) { _, _ ->
+                    .setPositiveButton(getString(R.string.send)) { _, _ ->
                         debug("User created waypoint")
                         model.sendWaypoint(waypoint {
                             name = nameInput.text.toString().ifEmpty { return@setPositiveButton }

app/src/main/java/com/geeksville/mesh/ui/components/PreferenceFooter.kt

@@ -48,7 +48,7 @@ fun PreferenceFooter(
             colors = ButtonDefaults.buttonColors(backgroundColor = Color.Green)
         ) {
             Text(
-                text = stringResource(id = R.string.save),
+                text = stringResource(id = R.string.send),
                 style = MaterialTheme.typography.body1,
                 color = if (!enabled) MaterialTheme.colors.onSurface.copy(alpha = ContentAlpha.disabled) else Color.DarkGray,
             )