Translated string sizes do not match source string sizes

The per-entry limit when parsing tstrings and string tables is 4096 because it's still parsing using a char array. Interestingly, the places where these strings are used are **not** limited to 4096 characters. I'm not sure if it's worth just increasing the char array size or if writing a version of parselo.cpp's `get_string()` that uses SCP_string is a better idea. Either way the difference in string size limit between source and translation isn't ideal.

Relatedly, commented out strings also cannot be larger than 4096 characters. I suspect it uses a similar buffer size for its character array also but I didn't investigate that part any further.