Add support for browsing a grammar

[jacobwegner]

• Browse hierarchy
• Extracting citations
• Statistics (e.g. Logeion or vocab.perseus.org)

Content

• Didakta, Pinakedon
• Smyth
• Latin grammar
• Other Arabic or Persian grammars

[jacobwegner]

@gregorycrane and @farnoosh-shamsian:

Based on some feedback from @jtauber, I've got an initial version of Didakta annotations deployed on Beyond Translation:

Grammatical Entries display mode

Words with annotations are shown in yellow.

Clicking on the entry title in the sidebar will highlight matching words in green.

Interlinear display mode

Toggle Gram. Tags on / off to show / hide tags:

Syntax trees display mode

Toggle Gram. Tags on / off to show / hide tags:

(I'm an experimenting with mapping the token annotations to the treebank words; there may be a few words dropped here and there.)

I'd like to do another pass soon that makes the interaction between clicks similar to the dictionary entry widget; right now the grammatical entries mode is the only one that has interactivity.

[jacobwegner]

I will be deploying this to production soon via https://github.com/scaife-viewer/beyond-translation-site/issues/93; I want to add attribution to Farnoosh for her work on the grammar before I do that.

[jacobwegner]

@gregorycrane and @farnoosh-shamsian: Would this be ok for the attribution on the grammatical entries?