add option to group by term

[StefanVukovic99]

This option allows grouping entries with missing readings, or different readings, primarily for non-ja languages.

Before	After

[Kuuuube]

Check that this doesnt break glossary handlebars if you havent already. Theres some logic that changes when grouping changes.

[StefanVukovic99]

Shouldn't be a problem there, it uses the existing termGrouped

[username-011]

This seems like a very awaited change, at least for me as a user.
If possible, I think it would be even more useful if the terms order after grouping respected the order of the dictionaries that they came from (not sure if that's the case on the screenshot above), will be useful for languages where there are multiple possible readings, but one is from a popular dictionary (shown to the top) vs more rare/old/regional dictionaries (where you need to scroll down).
Also maybe no need to show the term with no readings when there are 2+ terms?

[StefanVukovic99]

This should be ready now. The headword-reading pairs should sort by dictionary index, as @username-011 mentioned.

no need to show the term with no readings

Maybe, but I would leave it as-is for now, since removing it might break something else.

[Kuuuube]

Looks good!