LanguageFilter::Read_Word reads file one character at a time in unbuffered mode

`LanguageFilter::Read_Word` reads file one character at a time in unbuffered mode. This is very slow.

Need to upgrade

```c++
File *file = g_theFileSystem->Open_File("langdata.dat", File::READ | File::BINARY);
```

to at least

```c++
File *file = g_theFileSystem->Open_File("langdata.dat", File::READ | File::BINARY | File::BUFFERED);
```

or use RAM File.