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I suspect you didn't understood the question. MTBE was asking if schema.org structured data items must be in the language used in the subfolder. For instance, in www.domain.com/en/, will be the items written in English and in www.domain.com/es/ in Spanish? The answer is yes.

You're welcome. You do not want to include hreflang="x-default" tags for the specific language pages (whether in the sitemap or the code). You only want to include the x-default tag on non-language specific 'default' pages (for example, a default page that prompts the user to select a language or country). Here is a description from Google on their use of this particular tag: "The new x-default hreflang attribute value signals to our algorithms that this page doesn’t target any specific language or locale and is the default page when no other page is better suited." [Source]

Thanks for your reply, I submitted each language URL to google webmasters, Should i use international target option for each language to target the countries? will that hurt the language targeting? or i have to leave international targeting option unchecked for each language? Thanks in advance

Can i use a herflang sitemap with just the language attribute? Please check that out https://support.google.com/webmasters/answer/2620865?hl=en