[feat]修改flutter_string_get的语言配置为zh_CN

lib/resource/string.gen.dart

@@ -355,7 +355,7 @@ class StringName {
 class StringMultiSource {
   StringMultiSource._();
   static const Map<String, Map<String, String>> values = {
-    'en_US': {
+    'zh_CN': {
       'app_name': '追爱小键盘',
       'main_tab_keyboard': '键盘',
       'main_tab_mine': '我的',

pubspec.yaml

@@ -201,7 +201,7 @@ flutter_gen:
       - assets/color/color.xml
 
 flutter_string_get:
-  language: 'en_US'
+  language: 'zh_CN'