UI: Change Language: use a dialog instead of forcing first-time-wizard

The method of forcing first-time-wizard wasn't very effective because
1. it's ugly, and 2. after selecting the language at the wizard it either
imports the previous settings (together with the previous language thus
overriding the new language) or resets all other settings - which is not fun.

This patch uses a small dialog instead to only change the language, and within
it reuses the language panel from the first time wizard.

pcsx2/gui/Dialogs/ConfigurationDialog.h

@@ -133,6 +133,23 @@ namespace Dialogs
 		virtual wxString& GetConfSettingsTabName() const { return g_Conf->AppSettingsTabName; }
 	};
 
+	// --------------------------------------------------------------------------------------
+	//  InterfaceLanguageDialog
+	// --------------------------------------------------------------------------------------
+	class InterfaceLanguageDialog : public BaseConfigurationDialog
+	{
+	public:
+		InterfaceLanguageDialog(wxWindow* parent = NULL);
+		virtual ~InterfaceLanguageDialog() throw() { }
+
+		static wxString GetNameStatic() { return L"InterfaceLanguage"; }
+		wxString GetDialogName() const { return GetNameStatic(); }
+
+	protected:
+		virtual wxString& GetConfSettingsTabName() const { return g_Conf->AppSettingsTabName; }
+	};
+
+
 	// --------------------------------------------------------------------------------------
 	//  McdConfigDialog
 	// --------------------------------------------------------------------------------------

pcsx2/gui/Dialogs/SysConfigDialog.cpp

@@ -270,6 +270,19 @@ Dialogs::InterfaceConfigDialog::InterfaceConfigDialog(wxWindow *parent)
 	//wxDialogWithHelpers::AddOkCancel( NULL, false );
 }
 
+Dialogs::InterfaceLanguageDialog::InterfaceLanguageDialog(wxWindow* parent)
+	: BaseConfigurationDialog(parent, _("Language selector"), 400)
+{
+	*this += 5;
+
+	// Keep this in English - same as the menu item.
+	*this += Heading(L"New language will affect newly opened windows.\n");
+	*this += Heading(L"Full change will happen after restarting PCSX2.");
+	*this += new Panels::LanguageSelectionPanel(this) | StdCenter();
+
+	wxDialogWithHelpers::AddOkCancel();
+}
+
 // ------------------------------------------------------------------------
 Panels::AppearanceThemesPanel::AppearanceThemesPanel( wxWindow* parent )
 	: BaseApplicableConfigPanel( parent )

pcsx2/gui/MainMenuClicks.cpp

@@ -70,6 +70,11 @@ void MainEmuFrame::Menu_Language_Click(wxCommandEvent &event)
 	InterfaceConfigDialog(this).ShowModal();
 }
 
+void MainEmuFrame::Menu_ChangeLang(wxCommandEvent &event) // Always in English
+{
+	AppOpenDialog<InterfaceLanguageDialog>(this);
+}
+
 static void WipeSettings()
 {
 	wxGetApp().CleanupRestartable();
@@ -581,19 +586,6 @@ void MainEmuFrame::Menu_ShowConsole(wxCommandEvent &event)
 	wxGetApp().ProgramLog_PostEvent( evt );
 }
 
-void MainEmuFrame::Menu_ChangeLang(wxCommandEvent &event) // Always in English
-{
-	Msgbox::Alert ( L"Please restart PCSX2.\n"
-					L"\n"
-					L"First-Time-Wizard will then appear, where you can change the language.\n"
-					L"\n"
-					L"(You can keep other settings by choosing 'Import' when prompted)"
-					 );
-
-	wxGetApp().ForceFirstTimeWizardOnNextRun();
-}
-
-
 void MainEmuFrame::Menu_ShowConsole_Stdio(wxCommandEvent &event)
 {
 	g_Conf->EmuOptions.ConsoleToStdio = GetMenuBar()->IsChecked( MenuId_Console_Stdio );