This is quite a lot of work. I don’t think you can code that in a reasonable amount of time. You could use a multi-site setup and a plugin to map single posts and pages as language alternatives to each other. The plugin Multilingual Press does exactly that and all the other points you listed. … Read more
The templates use the internal name of the taxonomy. These will be the same in all languages. The internal name is the first part in register_taxonomy($taxonomy, $object_type, $args). What your users see is the translated name from the labels. So, no, you don’t have to recreate the templates for each language.
I am vaguely aware that it has something to do with the way WordPress is initialized. I know WPLANG can’t be changed on the fly. It’s how PHP works: You can’t change an already defined constant. But there’re filters for that. The following plugin is a sketch that you could use and try to see … Read more
Set language from url?
You should have all your databases utf8_general_ci if you’re website uses other than just Latin characters. Can you have a look at your database tables? If you can then have a look at the wp_posts table and see if they are ???? or actual characters. Otherwise your posts are saved wrong in the DB which … Read more
Multiple domains for with a single instal
Multilingual WordPress page – using URL to determine language?
qTranslate get content by language using wp_query
A fast way on Windows is the tool DUK. Edit and copy the config-file dsbs-wrapper.php to new server, the wp install and run the tool, the exe. It will check the database and will correction the strings.
cannot access subsites in wordpress multisite