[Flashcards/HTML] Use JavaScript for the Dialected Variants

[pishoyg]

You are already generating one for Bohairic / Sahidic. Create one for all dialects, it should be straightforward.
Then you get your Bohairic-first behaviour (which is requested in #102). But also, it's much simpler, cleaner, and more dialect-neutral.

[pishoyg]

Note: Here are some ideas:

• Embed links (buttons) in the dialect codes that would highlight / de-highlight the dialect codes everywhere on the page, and also all the spellings that belong to that dialect.
• Highlight the derivation rows that are explicitly marked as part of this dialect.
• Dim the derivation rows that are explicitly marked as belonging to other dialects but not this one.
• Undialected derivation rows maintain a normal style.
• While a dialect is highlighted, the next and prev links should point to the next page that has a word belonging to that dialect.
• Maybe also display a per-dialect group of words on top for each dialect that is highlighted.

Note: You have another use case for JavaScript: #134.

[pishoyg]

We have made great progress here!

• From the website's perspective, this is pretty much done.
• From Anki's perspective, we might want to consider using this feature for the decks.

[pishoyg]

Status:

• If we can persist the JavaScript variable across notes, so Anki remembers our preferences, then it should be possible to use this to display the dialect-oriented versions of the flashcards. There are some information about variable scopes here. Otherwise, a user would have to click on the dialect code(s) in every note in order to be able to see the version that they're after.
• Even if we accomplish the use of JavaScript for display, we can't filter out the notes that are uninteresting (because, for example, they don't contain any spellings for a given dialect). So it's likely that exporting different Anki decks will continue to be necessary.

Summary TODO:

• Persist the list of active dialects across notes.
• Decide whether to use this as the default display on Anki, even in the dialected versions. (We are currently inclined to.)

[pishoyg]

See #181.

[pishoyg]

Status:

• The d parameter gets persisted in localStorage, so if a user clicks a dialect, it propagates through notes.
• Once the app is closed, the d value is cleared! This is probably undesirable!
• [Flashcards/HTML] Add a reset Button #169 requests reset functionality for both Anki and Web. There is currently none.
• The dialected versions of the flashcards still uses the old non-JavaScript display, which lists the per-dialect spellings, rather than list all spellings and highlight the ones belonging to the dialect of interest.

Summary TODO:

• Persist the highlighted dialects between app runs, not just across notes.
• Add a reset button ([Flashcards/HTML] Add a reset Button #169, not here).
• Decide whether to use this as default display for the dialected versions.

[pishoyg]

Deprioritizing (by unassigning) because the current status is good enough.