(svn r19213) -Change: warn if a fallback sound set is loaded and tell the user where to download a proper sound setd

src/lang/english.txt

@@ -3308,6 +3308,9 @@ STR_ERROR_BMPMAP_IMAGE_TYPE                                     :{WHITE}... coul
 STR_WARNING_HEIGHTMAP_SCALE_CAPTION                             :{WHITE}Scale warning
 STR_WARNING_HEIGHTMAP_SCALE_MESSAGE                             :{YELLOW}Resizing source map too much is not recommended. Continue with the generation?
 
+# Soundset messages
+STR_WARNING_FALLBACK_SOUNDSET                                   :{WHITE}Only a fallback sound set was found. If you want sounds, install a sound set via the content download system.
+
 # Screenshot related messages
 STR_MESSAGE_SCREENSHOT_SUCCESSFULLY                             :{WHITE}Screenshot successfully saved as '{RAW_STRING}'
 STR_ERROR_SCREENSHOT_FAILED                                     :{WHITE}Screenshot failed!

src/openttd.cpp

@@ -1054,6 +1054,10 @@ void SwitchToMode(SwitchMode new_mode)
 
 		case SM_MENU: // Switch to game intro menu
 			LoadIntroGame();
+			if (BaseSounds::ini_set == NULL && BaseSounds::GetUsedSet()->fallback) {
+				ShowErrorMessage(STR_WARNING_FALLBACK_SOUNDSET, INVALID_STRING_ID, 0, 0, true);
+				BaseSounds::ini_set = strdup(BaseSounds::GetUsedSet()->name);
+			}
 			break;
 
 		case SM_SAVE: // Save game