[DataEntry] Allow adding to existing sense in new langauge

[imnasnainaec]

In Data Entry, when you type a vernacular form identical to that of other entries in the project, you can select one of those entries to modify. The senses from these existing entries are shown with gloss text from all glosses (no matter the language). When one of those senses is selected, the gloss text of its first gloss is used to auto-fill the gloss field.

• If the sense has a gloss in the current analysis language, that should be used rather than the first gloss
• If the sense does not have a gloss in the current analysis language, changing the gloss text should add to the selected sense rather than creating a new sense