Only update language if a field is edited in Edit view and is not empty when saved

[troughc]

Reference user story: #1371

Current behaviour - to be replaced with new behaviour

Events: Publishing an entity creates literals in a language field based on the displayed fallback language when the field was not touched
Events: Saving an event entity does NOT create a literal in a language field based on the fallback language when the field is not touched
Place/Person/Org: Saving an entity creates a literal in a language field based on a displayed fallback language when the field was not touched

New behaviour

1. Make events, places, persons and orgs all behave the same way when it comes to creating a literal in a language field.

• Remove the difference between saving and publishing in Events
• Make Save behave the same across all classes / entity types using Event saving behaviour as the model

2. Saving (publishing) an entity will only create a literal in a field that a user explicitly touched (edited) and has something in it (a text string). It will not create a literal in a field that is untouched:

• All entities: Saving an event entity will NOT create a literal in a language field based on the fallback language when the field is NOT touched
• Events: Publishing an event entity will NOT create a literal in a language field based on the fallback language when the field is NOT touched

3. Warnings will continue to appear to inform the user that there is content doesn't match the language on the website until all fields have been touched / updated (I believe this continues to work as is, no change)
4. In Edit view: what happens if the user touches / clicks in a field and deletes the fallback language text that is displayed, but does not replace it with anything (i.e. leaves the field empty)? A literal will not be created, i.e. we will NOT create a literal that is blank upon saving/publishing. Instead, the next time someone views that entity in Edit mode, the fallback language will be displayed.
5. TO BE DECIDED for Read-only view: I am still debating which approach to take if a fallback language is being displayed because there is no language literal. In the read-only view, should we:

• Show a field as empty, i.e. stop displaying the fallback language?
• Display the fallback language in the field and display the language literal tag (this would be a change)?
• leave it as is

6. In List views: leave it as is, no change.

[troughc]

@SyamBabu-M here is another ticket for you. Please go ahead and estimate and start work when you have time.

[saumier]

@troughc Looks good.

[SyamBabu-M]

@troughc @saumier What happens when "dismiss" is pressed in the banner, which indicates there are language fallbacks present?
Currently, pressing dismiss will enable all fallback values to be their active value. And upon saving these values will be saved.

[troughc]

@troughc @saumier What happens when "dismiss" is pressed in the banner, which indicates there are language fallbacks present?
Currently, pressing dismiss will enable all fallback values to be their active value. And upon saving these values will be saved

@SyamBabu-M 'Dismiss' should not enable the fallback languages to be the active value which is then saved (the fallback languages as the actual values). Dismiss is used by a user to close the banner only.

The big idea/goal is that the user intentionally sets (chooses) the fallback language as the active value. Let me know if you need any further clarification.