Disable download button when dictionary is already installed

[khaitruong922]

Currently works for KANJIDIC and BCCWJ.
In recommended-dictionaries.json, Jitendex has its title hardcoded as Jitendex, but the title of it after installed from the recommended section is Jitendex.org [2024-08-11]. Don't know if we have control over the title of Jitendex,

Fixes #1333

[jamesmaa]

I'm honestly fine hardcoding for the Jitendex check

[khaitruong922]

Apart from dictionary title, how about checking for downloadUrl too? The url should be the same for Jitendex.

[jamesmaa]

Great idea! Honestly the download url might be more canonical than title

[Kuuuube]

We probably do need to keep the check for title. Not all dicts have a download url.

[khaitruong922]

My BCCWJ does not have a downloadUrl, so I think it's safe to check for both.

[MarvNC]

KANJIDIC has dynamic titles now though, are you sure?

[khaitruong922]

@MarvNC You're right.
KANJIDIC and Jitendex should be disabled if installed after adding check for downloadUrl.