Some words have not been translated to Farsi yet

A follow up from !16 (merged) for #31 (closed):

There are a few minor translations missing:

• "Verification" (this is one of the page titles)
• "passphrase"
• "(allowed: %s)"

That last one is used in this sentence: "Username contains invalid characters (allowed: %s)." and the %s part is dynamically replaced with 'a-z, A-Z, 0-9, . - _ @' but in Farsi the %s should probably be to the left of the semicolon?

Link to the language file: fa.yml