You could get the localized pages by using LangID property of the CmsPageInfo object.
IList listofPages = manager.GetPages(0,
(page.LangID == CultureInfo.InvariantCulture.LCID)
culture = LocalizationManager.DefaultCulture;
culture = CultureInfo.GetCultureInfo(page.LangID);
You could use HasCurrentLanguageVersion property of the ICmsPage to check whether a given page exists in the current language.
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