Implement translation support for ScummVM GUI.

Based on patch #2903830: "Updated Translation Prototype" by alexbevi
which in turn is based on patch #1739965 by jvprat.

Currently it builds all translations right into ScummVM. Once the
feature will be accepted more widely, i.e. more translations will
pop up, it will be trivial to move translation strings to external
file.

Finished translation: Russian
Unfinished translation: Hungarian

Things which are nice to do:
 - Language code -> language mapping for more user friendness
 - Specifying fonts to be used with language
 - Updating of interface language without restart. It will require
   moving of much code to reflowLayout() methods for each dialog

The .po files must be in single byte encodings. I.e. no support
for Unicode.

svn-id: r49759

1 files changed, 20 insertions, 17 deletions

diff --git a/base/main.cpp b/base/main.cpp
index bfb6611a91..ad6118c905 100644
--- a/base/main.cpp
+++ b/base/main.cpp
@@ -47,6 +47,7 @@
 #include "common/fs.h"
 #include "common/system.h"
 #include "common/tokenizer.h"
+#include "common/translation.h"
 
 #include "gui/GuiManager.h"
 #include "gui/message.h"
@@ -101,20 +102,20 @@ static const EnginePlugin *detectPlugin() {
 	ConfMan.set("gameid", gameid);
 
 	// Query the plugins and find one that will handle the specified gameid
-	printf("User picked target '%s' (gameid '%s')...\n", ConfMan.getActiveDomainName().c_str(), gameid.c_str());
-	printf("  Looking for a plugin supporting this gameid... ");
+	printf(_t("User picked target '%s' (gameid '%s')...\n"), ConfMan.getActiveDomainName().c_str(), gameid.c_str());
+	printf(_t("  Looking for a plugin supporting this gameid... "));
 	GameDescriptor game = EngineMan.findGame(gameid, &plugin);
 
 	if (plugin == 0) {
-		printf("failed\n");
-		warning("%s is an invalid gameid. Use the --list-games option to list supported gameid", gameid.c_str());
+		printf(_t("failed\n"));
+		warning(_t("%s is an invalid gameid. Use the --list-games option to list supported gameid"), gameid.c_str());
 		return 0;
 	} else {
 		printf("%s\n", plugin->getName());
 	}
 
 	// FIXME: Do we really need this one?
-	printf("  Starting '%s'\n", game.description().c_str());
+	printf(_t("  Starting '%s'\n"), game.description().c_str());
 
 	return plugin;
 }
@@ -141,9 +142,9 @@ static Common::Error runGame(const EnginePlugin *plugin, OSystem &system, const
 		// Is a separate dialog here still required?
 
 		//GUI::displayErrorDialog("ScummVM could not find any game in the specified directory!");
-		const char *errMsg = Common::errorToString(err);
+		const char *errMsg = _(Common::errorToString(err));
 
-		warning("%s failed to instantiate engine: %s (target '%s', path '%s')",
+		warning(_t("%s failed to instantiate engine: %s (target '%s', path '%s')"),
 			plugin->getName(),
 			errMsg,
 			ConfMan.getActiveDomainName().c_str(),
@@ -200,7 +201,7 @@ static Common::Error runGame(const EnginePlugin *plugin, OSystem &system, const
 	while (!tokenizer.empty()) {
 		Common::String token = tokenizer.nextToken();
 		if (!DebugMan.enableDebugChannel(token))
-			warning("Engine does not support debug level '%s'", token.c_str());
+			warning(_("Engine does not support debug level '%s'"), token.c_str());
 	}
 
 	// Inform backend that the engine is about to be run
@@ -268,22 +269,22 @@ static void setupKeymapper(OSystem &system) {
 	mapper->registerHardwareKeySet(keySet);
 
 	// Now create the global keymap
-	act = new Action(globalMap, "MENU", "Menu", kGenericActionType, kSelectKeyType);
+	act = new Action(globalMap, "MENU", _("Menu"), kGenericActionType, kSelectKeyType);
 	act->addKeyEvent(KeyState(KEYCODE_F5, ASCII_F5, 0));
 
-	act = new Action(globalMap, "SKCT", "Skip", kGenericActionType, kActionKeyType);
+	act = new Action(globalMap, "SKCT", _("Skip"), kGenericActionType, kActionKeyType);
 	act->addKeyEvent(KeyState(KEYCODE_ESCAPE, ASCII_ESCAPE, 0));
 
-	act = new Action(globalMap, "PAUS", "Pause", kGenericActionType, kStartKeyType);
+	act = new Action(globalMap, "PAUS", _("Pause"), kGenericActionType, kStartKeyType);
 	act->addKeyEvent(KeyState(KEYCODE_SPACE, ' ', 0));
 
-	act = new Action(globalMap, "SKLI", "Skip line", kGenericActionType, kActionKeyType);
+	act = new Action(globalMap, "SKLI", _("Skip line"), kGenericActionType, kActionKeyType);
 	act->addKeyEvent(KeyState(KEYCODE_PERIOD, '.', 0));
 
-	act = new Action(globalMap, "VIRT", "Display keyboard", kVirtualKeyboardActionType);
+	act = new Action(globalMap, "VIRT", _("Display keyboard"), kVirtualKeyboardActionType);
 	act->addKeyEvent(KeyState(KEYCODE_F7, ASCII_F7, 0));
 
-	act = new Action(globalMap, "REMP", "Remap keys", kKeyRemapActionType);
+	act = new Action(globalMap, "REMP", _("Remap keys"), kKeyRemapActionType);
 	act->addKeyEvent(KeyState(KEYCODE_F8, ASCII_F8, 0));
 
 	mapper->addGlobalKeymap(globalMap);
@@ -319,6 +320,8 @@ extern "C" int scummvm_main(int argc, const char * const argv[]) {
 	// Update the config file
 	ConfMan.set("versioninfo", gScummVMVersion, Common::ConfigManager::kApplicationDomain);
 
+	// Enable translation
+	TransMan.setLanguage(ConfMan.get("gui_language").c_str());
 
 	// Load and setup the debuglevel and the debug flags. We do this at the
 	// soonest possible moment to ensure debug output starts early on, if
@@ -387,7 +390,7 @@ extern "C" int scummvm_main(int argc, const char * const argv[]) {
 			// Did an error occur ?
 			if (result != Common::kNoError) {
 				// Shows an informative error dialog if starting the selected game failed.
-				GUI::displayErrorDialog(result, "Error running game:");
+				GUI::displayErrorDialog(result, _("Error running game:"));
 			}
 
 			// Quit unless an error occurred, or Return to launcher was requested
@@ -413,8 +416,8 @@ extern "C" int scummvm_main(int argc, const char * const argv[]) {
 		} else {
 			// A dialog would be nicer, but we don't have any
 			// screen to draw on yet.
-			warning("Could not find any engine capable of running the selected game");
-			GUI::displayErrorDialog("Could not find any engine capable of running the selected game");
+			warning(_("Could not find any engine capable of running the selected game"));
+			GUI::displayErrorDialog(_("Could not find any engine capable of running the selected game"));
 		}
 
 		// We will destroy the AudioCDManager singleton here to save some memory.