Nice and Easy Plug-in

Nice plug-in, but not properly for beginners as you will have to dig into the code a little bit, especially as:
1. If you can nicely localize labels from menus, you can not localize URLs from links item in a menu (-> have to code it)
2. The WordPress + Themes Core are not translated !! Just the content of the posts are…. Sad, again have to code it or am I missing something ? (Need the localized .mo file in the wp-content/languages/ and themes languages folder, of course)
3. I saw that you have support for WPSEO, so I also added support for AMT (Add Meta Tags plugin) which I find light and better than WPSEO for Meta, Open Graph, Twitter cards….
4. Why these ugly letters in the menu instead of flags ?? At least offer a custom field in the admin page to add the Url of a png image for each language (like domain_path/flag-EN, domain_path/flag-DE, domain_path/flag-RU…)
5. The next/previous posts link is broken on category/tags pages as it is updated afterwards by wordpress core

As I love Stella and its price, here are the code to apply in the source files to make Stella the best and most simple WordPress Multi-lingual plugin !

Solution for 1., 2. & 3.

Here are the lines I did add in classes/class-post-localizer.php :
Added in start of Post_localizer :

add_filter('wp_nav_menu_objects', array($this, 'change_menu'), 1, 1);
add_filter( 'locale', array($this, 'wpse_52419_change_language'), 1, 1 );
if ( defined('AMT_DIR') ) {add_filter( 'amt_metadata_head', array($this, 'localize_AMT_metatag'), 1, 1 ); }

The related functions, are after the localize_wpseo_title function :

// Function to localize description Meta Tags from Add Meta Tags plugin (title is finely done by Stella)
// Try to catch excerpt, if empty, shorten the body - Works for Basic Meta, Open Graph, Twitter Card and Dublin Core
function localize_AMT_metatag( $metatags ) {
 global $post;
 $meta_localized = $metatags;
 if( (is_single() || is_page()) && ( STELLA_CURRENT_LANG != STELLA_DEFAULT_LANG ) ){	// Only Post, as Index is Ok (if no specific desc entered in AMT)
 for ($lesmetas=0; $lesmetas < count($metatags); $lesmetas++) {
    if (preg_match('#description"#', $metatags[$lesmetas]))  {
	(is_single()) ? $body_new = get_post_meta( $post->ID, '_excerpt-' . STELLA_CURRENT_LANG, true ) : $body_new = '';
	if ('' == $body_new ) { $body_new = get_post_meta( $post->ID, '_body-' . STELLA_CURRENT_LANG, true ); }
	$body_new = preg_replace('#<a(.+)/a>#', '...', wp_trim_excerpt( $text )); // truncate the obtained text with WP standard function
	$meta_localized[$lesmetas] = preg_replace('#content="(.+)"#isU', 'content="'.$body_new.'"', $meta_localized[$lesmetas]);
	}
     }
   }
   return $meta_localized;
}
function change_menu($items) {
if ( STELLA_CURRENT_LANG != STELLA_DEFAULT_LANG ){
  foreach($items as $item){
	$zonetest = $item->post_title;
	if ($zonetest == 'The_Label') {
            $item->url = 'The_Localized_Url'; } // Do this for all
  }
  return $items;
}
function wpse_52419_change_language( $locale ) {
if ( STELLA_CURRENT_LANG != STELLA_DEFAULT_LANG ){ load_textdomain( 'default', WP_CONTENT_DIR . '/languages/fr_FR.mo' ); return 'fr_FR'; } else { return 'en_US'; }
}

I have hardcoded the language, but you can use the reformated STELLA_CURRENT_LANG

Solution for 4. (flags to choose language)

So I add to modify the classes/class-menu-language-switcher.php to modify the link line :

$html = "<li><a href=$href><img src=\"path_to_your_image-".strtoupper($title).".png\" alt=\"".$title."\" style=\"border:none\" /></a></li>";

Solution for 5. (next/previous posts links)

Code to add in /stella-plugin.php at the end, just after the add_action(‘after_setup_theme’,…)

// function to fix the next/previous postS links (single post work fine already)
add_filter('get_pagenum_link', 'stella_next_previous_fix');

function stella_next_previous_fix($url) {
	if ( STELLA_CURRENT_LANG != STELLA_DEFAULT_LANG ){
		if( Url_Changer::is_subfolder() ){ // if single wordpress is in subfolder
			$siteurl = Url_Changer::get_subfolder_name();
			$url = str_replace( $siteurl.'/'.STELLA_CURRENT_LANG, '', $url);
		}
		else { $siteurl = Url_Changer::get_option('siteurl'); }
		$url = Url_Changer::just_add_language_prefix_to_url( $url );
	}
	return $url;
}

Hope it will be useful to those of you who want a great, but cheap, and easy localization plugin for wordpress.

STELLA DEVELOPERS, It will be a great Idea to implement all these fixes in the next version… It will definitely make STELLA plugin the PERFECT multi language plugin, easy and light, as more easy-to-use for WP beginners who won’t have to digg into the codes and modify the sources ! 🙂

PS: Thanks to tosho for pointing me to the right direction with his version of the wpse_52419_change_language function and to Scott for pointing to the right direction for the next/previous posts link 😉