Multi dictionaries can't be specified in a multi dictionary passed with an absolute path

[MageJohn]

Using a multi-dictionary in a personal dictionary file fails with an error about the language being unknown, but only when the personal dictionary is specified with an absolute path.

So, given a personal dictionary called /tmp/personal.pws that looks like this:

personal_ws-1.1 en_GB 0

Running aspell -d "en_GB" -p personal.pws list while in /tmp will work fine and start listening to standard input. However, running aspell -d "en_GB" -p /tmp/personal.pws list will fail with the error: Error: /tmp/personal.pws: The language "en_GB" is not known. This is probably because: the file "[...]/lib/aspell-0.60/en_GB.dat" can not be opened for reading.