chore: Translate transifex_input.json in pt_PT

63% of minimum 50% translated source file: 'transifex_input.json'
on 'pt_PT'.

Sync of partially translated files: 
untranslated content is included with an empty translation 
or source language content depending on file format

translations/frontend-app-course-authoring/src/i18n/messages/pt_PT.json

@@ -64,7 +64,7 @@
   "course-authoring.export.description2": "Caution: When you export a course, information such as MATLAB API keys, LTI passports, annotation secret token strings, and annotation storage URLs are included in the exported data. If you share your exported files, you may also be sharing sensitive or license-specific information.",
   "course-authoring.export.title-under-button": "Export my course content",
   "course-authoring.export.button.title": "Export course content",
-  "course-authoring.files-and-uploads.heading": "Files and uploads",
+  "course-authoring.files-and-uploads.heading": "Files",
   "course-authoring.files-and-uploads.subheading": "Conteúdo",
   "course-authoring.files-and-upload.apiStatus.message": "{actionType} {selectedRowCount} file(s)",
   "course-authoring.files-and-upload.apiStatus.addingAction.message": "Adicionar",
@@ -134,7 +134,7 @@
   "header.links.outline": "Estrutura Geral",
   "header.links.updates": "Atualizações",
   "header.links.pages": "Páginas & Recursos",
-  "header.links.filesAndUploads": "Ficheiros & Carregamentos",
+  "header.links.filesAndUploads": "Files",
   "header.links.textbooks": "Livros Didáticos",
   "header.links.videoUploads": "Envios de Vídeo",
   "header.links.scheduleAndDetails": "Calendário & Detalhes",