Remove gendered pronouns

While he or she is not specifically gender normative, they is unambiguously not; moreover, it is more concise, equally understandable, and neutral.
Correct small spanish translation inconsistency

Used 'clave' for key appropriately, except in line 5213, where 'llave' was used -- that is translated more to physical key to unlock something, while 'clave' is more used for codes and passkeys.
Merge pull request #201 from brittlewis12/master

Remove gendered pronouns & correct small spanish translation.