All translations of forum topics are displayed - no matter what language the site is switched to.

The reason may be block caching.

(Not very helpful issue title btw)

I have exactly the same problem: Forums are localized and forum names are displayed translated, but translated forum topics show up alltogether regardless of how the language is switched to, whereas I would expect a "filtered" view of translated forum topics depending on current language of the site.
However, if I look at the overall forum list, everything is OK: Depending on to what language the site is switched to, the numbers of English or (in my case) German topics in the resp. forums is displayed correctly (only the number of topics in English or German depending on current language of the site).
Moreover, if I view the forum topic and switch the language while viewing, the translated version is displayed correctly, too.
BUT while viewing the topic list of the forum (e.g. "General discussion"), I constantly get listed all topics (resp.all translated versions of my topics).
Any idea of how to fix this? Maybe it is only a wrong configuration setting?

This is NOT a recommended fix, but here how to solve this issue quickly:

Add this at line 770 of "/modules/forum/forum.module":

global $language;

$keys = array_keys($_forums);
foreach($keys as $key)
{
  if($_forums[$key]->language != $language->language
  && $_forums[$key]->language != LANGUAGE_NONE)
    unset($_forums[$key]);
}

I still have this issue (latest dev of drupal 7 and i18n).

When i click on forum and translate it - everything is fine. Number of topics/answers are changed as a description language. But when I choose a specific forum (translated forum taxonomy term) - list of topics aren't changed... They numbers/answers still stay the same only the descriptions are translated properly. The path use a taxonomy ID not a translated forum taxonomy name...

Old but related: http://drupal.org/node/584356

Maybe better in D7.

Don't think so :)

http://drupal.org/node/277689

When you browse a forum list in English and click on specific forum then English taxonomy forum path looks fine. But now when you click on Italian translation the path is wrong (ID).

In other way:

When you browse a forum list in Italian and click on specific forum then Italian taxonomy forum path looks fine. But now when you click on English translation the path is wrong (ID).

So it must be something with the way drupal forum choose it's taxonomy language (probably i18n related). I guess AF isn't a side here.

Check:

- Language selection module (i18n_select)
- Admin language (may interfere with language selection).

I have checked taxonomy terms options - I have enabled:

Content to filter by language
- Select nodes by language
- Select taxonomy terms by language

In Language - Detection and selection I have checked:

User interface text language detection:
- Determine the language from a request/session parameter.
- Determine the language from the URL (Path prefix or domain).

Content language detection:
- Use the detected interface language.

I tried to change those options but without any results...

Try switching detection methods, set URL first.

Looks like not a bug but a misconfiguration or clashes with other modules. To be reconsidered if this can be reproduced with Drupal core + i18n alone.

Jose thx for you interest on this. On clean drupal 7.12 (locale, forum enabled) and i18n I got:

Error
The website encountered an unexpected error. Please try again later.
Error message
PDOException: SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'status' in where clause is ambiguous: SELECT f.tid AS tid, COUNT(n.nid) AS topic_count, SUM(ncs.comment_count) AS comment_count FROM {node} n INNER JOIN {node_comment_statistics} ncs ON n.nid = ncs.nid INNER JOIN {forum} f ON n.vid = f.vid INNER JOIN {node} node ON f.tid = node.tid WHERE (status = :db_condition_placeholder_0) AND (n.language IN (:db_condition_placeholder_1, :db_condition_placeholder_2)) GROUP BY tid; Array ( [:db_condition_placeholder_0] => 1 [:db_condition_placeholder_1] => en [:db_condition_placeholder_2] => und ) in forum_forum_load() (line 779 of C:\xampp\htdocs\drupal\modules\forum\forum.module).

[related - http://drupal.org/node/1309142#comment-5592678 and http://drupal.org/node/1509508]

so with latest i18n you can access forum.

But when you translate forum and it's container and set everything up there is still issue I described - http://drupal.org/node/1331724#comment-5876486 (now when you click on other language the forum taxonomy (container) show up without any topics inside...) It seems that when you translate forum taxonomy you got for example:

computer forum EN (id2)
computer forum FR (id3)

Now when you browse top level of forum in EN you see proper ID when hover on forum taxonomy link (id2 in EN and id3 in FR). But when you get inside [computer forum EN (id2)] and try to click on other language (FR) you see (in Language switcher block - User interface text) proper language prefix but the same ID-2. It should be ID3.

I have set URL method first even test it a little bit more but without any results.

When I try to use multilingual forum support on my site I had the same issue.

Is there any chance to fix this in incoming newest version of i18n (with new variable version)?

@klonos How did you manage this to work ? By simply installing latest dev of drupal and i18n ? Cause I can't get this to work.

@batigol I think you should create a separate issue cause your (and mine, cause I have the same) problem is different then @klonos.
This is serious bug cause it cut off multilingual ability on drupal forum.

With latest releases of i18n and variable modules this problem is still active. Some topics even appear twice (when edited) on forum topic list...

EDIT: It's look like the translated taxonomy terms is used for both language.

........................- ITA topics of EN term
........- term (EN) - EN topics of EN term
forum
........- term (ITA) - ITA topics os ITA term
........................- EN topics of ITA term

and it should looks like:

........- term (EN) - EN topics of EN term
forum
........- term (ITA) - ITA topics os ITA term

I hope it looks clear to you and you know what I'm talking about. Language switcher block should switch terms not language IN terms (but maybe I understand something wrong ?).

I have problem with this and It seems to work just as you described. But I could swear I saw a drupal 7 multilingual site with forum working like it should but I can't remember address right now.

@Jose Reyero can you confirm this ? Cause no matter what options I set up I can't get proper translation of my forum.

Any ETA on this ?

Don't look for fast fix. This has been a problem for ages - I first found this in D7.4 and it still persist.

http://drupal.org/node/1548626