[SalesForce] How to get plural label of a standard object inside salesforce lightning component

I just heard from Farhan Tahir, the product manager for Aura. He's confirmed that it is in fact a bug (W-3342864).

UPDATE: the bug's been nevered. PM guidance is to "use lightning namespaced components. force:inputField should be replaced with lightning:inputField (or even better with lightning-input-field, which is the LWC version)."

When you create a custom object you choose:

• Label
• Plural Label
• Object Name

While it is convention to use a singular name for a table (AKA an SObject) it sounds like you chose a plural name. If you haven't gone too far in your development I suggest you change the "Object Name" back to the singular.

There is no automatic recognition of singular/plural naming in the product that I know of; the "Child Relationship Name" does get defaulted to a plural (or at least has an "s" appended) by the setup UI when a lookup relationship is created.

Providing the singular and plural form of the label allows a default detail page (where there is only one object) and a default list page (where there are many objects) to automatically use the right term.

If the standard controller does all you need just use it. If you require some extra code later you can add a controller extension class for that extra code and continue to leverage the standard controller. Another benefit of basing your page on the standard controller is that you can then override standard actions such as new and edit (if you wish) with your page; this allows you to replace the platform's default page everywhere without having to add custom links or custom buttons.