Change keyword args for build_dictionary.py

[sviperm]

I want to change keyword args in _parse_args function, -p and -P have similar letter, but different cases. Suggestion:

• "-p", "--path" -> "-f", "--file_path"
• "-P", "--parse_input" -> "-p", "--parse_input"

I can update code on next +- week, when I'll work on creating larger dictionary for Russian.

[barrust]

resolved by #102