Preferences crash on 0.85-test (uses method only available in android-21)

Oops, I accidentally used a method I shouldn't have - not sure why Android Studio or even the SDK while compiling didn't kick up a bigger stink. Usually usages like this cause a fatal error (aka red swiggly line) in my IDE.

E  FATAL EXCEPTION: main 
E  Process: org.fdroid.fdroid, PID: 1906
E  java.lang.NoSuchMethodError: java.util.Locale.forLanguageTag
E      at org.fdroid.fdroid.views.fragments.PreferencesFragment.langSpinner(PreferencesFragment.java:304)
E      at org.fdroid.fdroid.views.fragments.PreferencesFragment.updateSummary(PreferencesFragment.java:144)
E      at org.fdroid.fdroid.views.fragments.PreferencesFragment.onResume(PreferencesFragment.java:320)
E      at android.support.v4.app.Fragment.performResume(Fragment.java:1547)
E      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:978)
E      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1121)
E      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1103)
E      at android.support.v4.app.FragmentManagerImpl.dispatchResume(FragmentManager.java:1911)
E      at android.support.v4.app.FragmentActivity.onResumeFragments(FragmentActivity.java:467)
E      at android.support.v4.app.FragmentActivity.onPostResume(FragmentActivity.java:456)
E      at android.support.v7.app.ActionBarActivity.onPostResume(ActionBarActivity.java:116)
E      at android.app.Activity.performResume(Activity.java:5323)
E      at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2778)
E      at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2817)
E      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2250)
E      at android.app.ActivityThread.access$800(ActivityThread.java:135)
E      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
E      at android.os.Handler.dispatchMessage(Handler.java:102)
E      at android.os.Looper.loop(Looper.java:136)
E      at android.app.ActivityThread.main(ActivityThread.java:5017)
E      at java.lang.reflect.Method.invokeNative(Native Method)
E      at java.lang.reflect.Method.invoke(Method.java:515)
E      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
E      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
E      at dalvik.system.NativeStart.main(Native Method)

I'll push a fix for this soon, as it stopped me getting into Preferences on devices older than my android-21 device.