Add deviceLocale to constants

RNDeviceInfo/RNDeviceInfo.m

@@ -120,6 +120,12 @@ RCT_EXPORT_MODULE()
     return deviceName;
 }
 
+- (NSString*) deviceLocale
+{
+    NSString *language = [[NSLocale preferredLanguages] objectAtIndex:0];
+    return language;
+}
+
 - (NSDictionary *)constantsToExport
 {
     UIDevice *currentDevice = [UIDevice currentDevice];
@@ -133,6 +139,7 @@ RCT_EXPORT_MODULE()
              @"model": self.deviceName,
              @"deviceId": self.deviceId,
              @"deviceName": currentDevice.name,
+             @"deviceLocale": self.deviceLocale,
              @"uniqueId": uniqueId,
              @"bundleId": [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleIdentifier"],
              @"appVersion": [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleShortVersionString"],

android/src/main/java/com/learnium/RNDeviceInfo/RNDeviceModule.java

@@ -64,6 +64,7 @@ public class RNDeviceModule extends ReactContextBaseJavaModule {
     constants.put("systemVersion", Build.VERSION.RELEASE);
     constants.put("model", Build.MODEL);
     constants.put("deviceId", Build.BOARD);
+    constants.put("deviceLocale", this.reactContext.getResources().getConfiguration().locale.toString());
     constants.put("uniqueId", Secure.getString(this.reactContext.getContentResolver(), Secure.ANDROID_ID));
     constants.put("systemManufacturer", Build.MANUFACTURER);
     constants.put("bundleId", packageName);

deviceinfo.js

@@ -37,5 +37,8 @@ module.exports = {
   },
   getDeviceName: function() {
     return RNDeviceInfo.deviceName;
+  },
+  getDeviceLocale: function() {
+    return RNDeviceInfo.deviceLocale;
   }
 };