Justin definitely had the right idea on the above, but wanted to make a couple of clarifications.
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Input mask does, by default, limit you to entering only English characters if the alpha character wildcard (specifically "a") is used
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However, because input masking also sets an exact constraint on the number of charactrs that must be entered, it's not necessarily ideal for a First Name or Job Title field, which would inherently have users entering different numbers of characters
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Example: If you set the wildcard in the input mask as "aaaaa" (5 a's), for the "First Name" field, unless a user enters a name that is exactly 5 characters long, it will not save.
My recommendation with regards to input masks are to use them for fields that have very standardized inputs such as phone numbers or zipcodes.