Support replace feature; close #188; multiple bug fixes on upload

Former-commit-id: 30b18e418111df00903965a7e4135441cd1767a1 [formerly 60393b5e1a291d1aab2313e7dd8cd2e1e203c03b] [formerly c372bc1355db36d2d7b0bc602977616ae52a141c [formerly 6ee846ef0eab0f3b91ff3557877cd2eb63acb505]]
Former-commit-id: c6c5aa9646c78fe86af74aac00cc1c7c307ad678 [formerly 6d3accd032458203105a474b0f8204d8206c2440]
Former-commit-id: ab35a8effb0b01406bef44328ef3c45f5ea1cbfd

assets/src/i18n/en.yaml

@@ -13,6 +13,7 @@ buttons:
   new: New
   next: Next
   ok: OK
+  replace: Replace
   previous: Previous
   rename: Rename
   reportIssue: Report Issue
@@ -84,6 +85,10 @@ prompts:
   newFileMessage: Write the name of the new file.
   numberDirs: Number of directories
   numberFiles: Number of files
+  replace: Replace
+  replaceMessage: >
+    One of the files you're trying to upload is conflicting because of its name.
+    Do you wish to replace the existing one?
   rename: Rename
   renameMessage: Insert a new name for
   show: Show

assets/src/i18n/pt.yaml

@@ -15,6 +15,7 @@ buttons:
   ok: OK
   previous: Anterior
   rename: Renomear
+  replace: Substituir
   reportIssue: Reportar Erro
   save: Guardar
   search: Pesquisar
@@ -86,6 +87,10 @@ prompts:
   numberFiles: Número de ficheiros
   rename: Renomear
   renameMessage: Insira um novo nome para
+  replace: Substituir
+  replaceMessage: >
+    Já existe um ficheiro com nome igual a um dos que está a tentar enviar. Deseja
+    substituir?
   show: Mostrar
   size: Tamanho
 settings: