[BUG] Change the way the spellchecker uses the personal dictionary

[Ángel Gómez]

For some reason, the spellchecker doesn't like the *.rws approach if the dictionary contains accents. After investigating a bit it looks like it is possible to use a different type of dictionary, that does not require creating a *.rws dictionary.

An example: here.

See https://linuxcommand.org/lc3_man_pages/aspell1.html (--personal)