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For my forum package I created an extension method for the localizationservice


        public static string GetOrCreateDictionaryValue(this ILocalizationService localizationService, string key, string defaultValue,string isoCode = null)
        {
            var languageCode = isoCode ?? System.Threading.Thread.CurrentThread.CurrentUICulture.Name;
            if (languageCode.StartsWith("en_"))
            {
                languageCode = "en";
            }
            var dictionaryItem = localizationService.GetDictionaryItemByKey(key) ?? key.Split('.').Aggregate((IDictionaryItem)null, (item, part) =>
            {
                var partKey = item is null ? part : $"{item.ItemKey}.{part}";
                
                return localizationService.GetDictionaryItemByKey(partKey) ?? localizationService.CreateDictionaryItemWithIdentity(partKey, item?.Key, partKey.Equals(key) ? defaultValue : string.Empty);
            });
            var currentValue = dictionaryItem.Translations?.FirstOrDefault(it => it.Language.IsoCode == languageCode);
            if (!string.IsNullOrWhiteSpace(currentValue?.Value))
                return currentValue.Value;
            return $"[{key}]";
        }