Add Japanese language to DefaultLanguagesCreator

Add the Japanese language as an available language.  The .xml file is in the project, so there is no clear reason on why it was excluded to begin with.  Tested locally and the language loads and the flag is displayed.

Author: SteveArr

aspnet-core/src/AbpCompanyName.AbpProjectName.EntityFrameworkCore/EntityFrameworkCore/Seed/Host/DefaultLanguagesCreator.cs

@@ -24,7 +24,8 @@ private static List<ApplicationLanguage> GetInitialLanguages()
                 new ApplicationLanguage(null, "tr", "Türkçe", "famfamfam-flags tr"),
                 new ApplicationLanguage(null, "ru", "Русский", "famfamfam-flags ru"),
                 new ApplicationLanguage(null, "zh-CN", "简体中文", "famfamfam-flags cn"),
-                new ApplicationLanguage(null, "es-MX", "Español México", "famfamfam-flags mx")
+                new ApplicationLanguage(null, "es-MX", "Español México", "famfamfam-flags mx"),
+                new ApplicationLanguage(null, "ja", "日本語", "famfamfam-flags jp")
             };
         }
 
@@ -58,4 +59,4 @@ private void AddLanguageIfNotExists(ApplicationLanguage language)
             _context.SaveChanges();
         }
     }
-}
+}