Contextual trigger Open and Close labels need a verb translation context

Problem/Motivation

The contextual links trigger uses uncontextualized Open and Close strings. Open can describe a state or an action. A translation appropriate for the state can therefore appear on the action button: for example, Spanish Abierta instead of Abrir.

Steps to reproduce

1. Enable Contextual Links and Interface Translation and add Spanish.
2. Translate the uncontextualized Open string as Abierta.
3. View a page with contextual links as a user with permission to use them, in Spanish.
4. Inspect the contextual trigger accessible label. It uses the adjective rather than the action verb.

Proposed resolution

Use the Verb translation context for both Open and Close in core/modules/contextual/js/contextual.js. This lets translators distinguish the trigger actions from state labels without changing uncontextualized translations elsewhere.

Remaining tasks

Review the patch and add regression coverage for contextual trigger translations.

User interface changes

No English label change. Translated labels can use the appropriate verbs.

API and data model changes

None.