i18n(android): the interface speaks English, like the desktop app

It was in French because the conversation is, and I never asked. The desktop
app the client mirrors says Add field, Attach file, Show previous versions -
someone moving between the two would notice the seam.

Every visible string moved: buttons, statuses, detail row captions, log lines
and the biometric prompt, plus the messages the modules surface through
LastStoreError and LastBiometricError.

Code comments stay in French. They address the author, not the user, and that
is already the language of CLAUDE.md and much of the repo.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

android-client/PMA.Store.pas

@@ -594,7 +594,7 @@ begin
   LStore := OpenKeyStore;
   LCert := LStore.getCertificate(StringToJString(KEY_ALIAS_WRAP));
   if LCert = nil then
-    raise EPMAStore.Create('Cle publique introuvable dans le Keystore');
+    raise EPMAStore.Create('Public key not found in the Keystore');
   LPub := LCert.getPublicKey;
   LFactory := TJKeyFactoryX.JavaClass.getInstance(LPub.getAlgorithm);
   Result := LFactory.generatePublic(
@@ -804,7 +804,7 @@ begin
 end;
 {$ELSE}
 begin
-  raise EPMAStore.Create('Le stockage Keystore est propre a Android');
+  raise EPMAStore.Create('Keystore storage is Android-only');
 end;
 {$ENDIF}