i18n: add missing pt-PT (European Portuguese) strings

[imparpaulo01]

What

Completes the European Portuguese (pt-PT) locale on dev: adds the 9 label.* strings that exist in en-US.json but were missing from pt-PT.json. These are recently-added feature strings (heatmaps, property filter, activity by property, cumulative, LLM, period, select event).

Notes

• Only public/intl/messages/pt-PT.json is changed (+9 lines, no reordering).
• Translations follow the terminology already used in the file (Filtro, Propriedade, Período anterior, Selecionar …) and European-Portuguese conventions, distinct from pt-BR.
• LLM is kept untranslated, consistent with several other acronyms already left as-is in the locale (URL, UTM, CLS, FCP).

Strings added

key	en-US	pt-PT
label.cumulative	Cumulative	Cumulativo
label.property-filter	Property Filter	Filtro de propriedade
label.activity-by-property	Activity by property	Atividade por propriedade
label.heatmap	Heatmap	Heatmap
label.heatmap-description	Visualize where visitors click and how far they scroll on your pages.	Visualize onde os visitantes clicam e até onde percorrem as suas páginas.
label.heatmaps	Heatmaps	Heatmaps
label.llm	LLM	LLM
label.period	Period	Período
label.select-event	Select an event	Selecionar evento

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[greptile-apps]

Greptile Summary

This PR adds missing European Portuguese UI labels.

• Nine label.* strings added to pt-PT messages.
• New labels cover heatmaps, property filters, periods, events, cumulative views, and LLM.
• Existing message-file structure and key placement are preserved.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.
• The added keys match existing English message keys.
• The added strings do not introduce placeholder mismatches.

Important Files Changed

Filename	Overview
public/intl/messages/pt-PT.json	Adds missing European Portuguese translations for existing label keys.

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