Complete the Spanish and Italian translations (7 missing strings)

[GrahamStrickland]

package.nls.json has 76 keys; package.nls.es.json has 71 and package.nls.it.json has 74. The missing keys fall back to English at runtime, so those strings render untranslated. No orphaned keys in either file.

Missing from both:

key	English
harbour.launch.env	Environment variables to add to the debugged program's environment
harbour.launch.trace	Write a diagnostic log of the debug session to harbour-dbg-crash-<pid>.log in the system temp directory

Missing from es only:

key	English
harbour.task.HBMK2.output	output file name
harbour.task.HBMK2.provideName2	build current file
harbour.task.HBMK2.provideName3	build current file for debugging

The two shared ones are the env and trace launch attributes added in 1.3.0 — the feature added base keys without translations, which is the pattern worth heading off. Both are user-facing: they appear as attribute descriptions in launch.json IntelliSense.

Surfaced while adding message-bundle tests in #11; the fallback path is now covered by a test asserting an untranslated key resolves to its base string.

Acceptance:

• The 5 es and 2 it keys translated
• A check that flags base keys absent from a locale bundle, so this does not silently recur

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Filed by Claude (Opus 4.8) on behalf of @GrahamStrickland.