Metalanguage is language or symbols used when language itself is being discussed or examined. In logic and linguistics, a metalanguage is a language used to make statements about statements in another language (the object language). Expressions in a metalanguage are often distinguished from those in an object language by the use of italics, quotation marks, or writing on a separate line.
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The error “The Page is Missing Meta Language Information” is appeared when you select the “SEO Analyzer” in the Bing Webmaster Tools.
The error can be fix by doing following action which is recommended by Bing itself.
Use <meta http-equiv=”content-language” content=”ll-cc”> tag in the <head> section of your page, where “ll-cc” stands for the culture code of the language and country/region the content applies to. Alternatively use the lang=”ll-cc” attribute on either the <html> or the <title> tag .