Issue #3630637: Translate the component name, description and prop and slot titles in the dialog

Translates the component's name and description and each prop's and slot's title and description in SdcDiscovery, as core translates meta:enum labels: props with their x-translation-context, the rest with the empty context. Adds SdcDiscoveryTest::testTextsAreTranslated(), which fails without the change.

AI usage: AI-Generated: Yes. I used Claude Code (Anthropic) to write the change and the test. I verified it in the browser in English and Portuguese, and reviewed the code.

Closes #3630637