Fixed: Localization for two part language dialects

Fixes #999

src/NzbDrone.Core/Localization/LocalizationService.cs

@@ -45,14 +45,14 @@ namespace NzbDrone.Core.Localization
 
         public Dictionary<string, string> GetLocalizationDictionary()
         {
-            var language = IsoLanguages.Get((Language)_configService.UILanguage).TwoLetterCode;
+            var language = GetSetLanguageFileName();
 
             return GetLocalizationDictionary(language);
         }
 
         public string GetLocalizedString(string phrase)
         {
-            var language = IsoLanguages.Get((Language)_configService.UILanguage).TwoLetterCode;
+            var language = GetSetLanguageFileName();
 
             return GetLocalizedString(phrase, language);
         }
@@ -66,7 +66,7 @@ namespace NzbDrone.Core.Localization
 
             if (language.IsNullOrWhiteSpace())
             {
-                language = IsoLanguages.Get((Language)_configService.UILanguage).TwoLetterCode;
+                language = GetSetLanguageFileName();
             }
 
             if (language == null)
@@ -84,6 +84,19 @@ namespace NzbDrone.Core.Localization
             return phrase;
         }
 
+        private string GetSetLanguageFileName()
+        {
+            var isoLanguage = IsoLanguages.Get((Language)_configService.UILanguage);
+            var language = isoLanguage.TwoLetterCode;
+
+            if (isoLanguage.CountryCode.IsNotNullOrWhiteSpace())
+            {
+                language = string.Format("{0}_{1}", language, isoLanguage.CountryCode);
+            }
+
+            return language;
+        }
+
         private Dictionary<string, string> GetLocalizationDictionary(string language)
         {
             if (string.IsNullOrEmpty(language))
@@ -109,9 +122,17 @@ namespace NzbDrone.Core.Localization
             var dictionary = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
 
             var baseFilenamePath = Path.Combine(prefix, baseFilename);
+
             var alternativeFilenamePath = Path.Combine(prefix, GetResourceFilename(culture));
 
             await CopyInto(dictionary, baseFilenamePath).ConfigureAwait(false);
+
+            if (culture.Contains("_"))
+            {
+                var languageBaseFilenamePath = Path.Combine(prefix, GetResourceFilename(culture.Split('_')[0]));
+                await CopyInto(dictionary, languageBaseFilenamePath).ConfigureAwait(false);
+            }
+
             await CopyInto(dictionary, alternativeFilenamePath).ConfigureAwait(false);
 
             return dictionary;
@@ -145,11 +166,11 @@ namespace NzbDrone.Core.Localization
 
         private static string GetResourceFilename(string culture)
         {
-            var parts = culture.Split('-');
+            var parts = culture.Split('_');
 
             if (parts.Length == 2)
             {
-                culture = parts[0].ToLowerInvariant() + "-" + parts[1].ToUpperInvariant();
+                culture = parts[0].ToLowerInvariant() + "_" + parts[1].ToUpperInvariant();
             }
             else
             {