Gives a list of valid Language Codes for Google Fonts, or validates that the language codes given are valid.
google_language_codes(language_codes = c("latin", "latin-ext", "sinhala", "greek", "hebrew", "vietnamese", "cyrillic", "cyrillic-ext", "devanagari", "arabic", "khmer", "tamil", "greek-ext", "thai", "bengali", "gujarati", "oriya", "malayalam", "gurmukhi", "kannada", "telugu", "myanmar"))
| language_codes | Vector of potential Google language codes |
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