Drupal, menu links multilanguage
I don't know what get_menu_weight() returns (it is not in the standard Drupal API, is it?), so the following is the answer for a general case in Drupal 7.

In short, as long as the menu item is linked to a node, and if the node has at least one translation, the following code should work to get a path-alias of the node for all the translatable languages:  

$hstpath = translation_path_get_translations('node/123');
array_walk($hstpath, function(&amp;$v, $k){$v = drupal_get_path_alias($v,$k);});


gives an associated aray like:  

Array(
  [en] =&gt; info/basic.html
  [fr] =&gt; info/basic.html
)


where both English (en) and French (fr) versions have the same path-alias of info/basic.html.

How to convert this path-string to a link to the node to view in the desired language depends on both your language-detection configuration and with which language environment you would like to display the node.

For example, if the URL with the path-alias is given the highest priority, then add the prefix of /fr/ to the French node (as long as French is not configured to be the default language with no path-prefix defined).  In addition, you may need to add base_path() at the head, if Drupal is not installed in the top directory of the website.

For a reference, a candidate answer to &quot;Menu links not being translated&quot; explains some basic for the Drupal menu with i18n.