dear community,
i currently installed silverstripe in the newest version, plus Translateable v2.0 (the "master" did'nt worked).

I will now tell you what I exactly did, step by step, also for the next persons who are searching for a solution:

- Download & Installed SilverStripe
- Download Translateabe v2.0, renamed the folder to "translateable" and copied into my root directory (/silverstripe/translateable)

- Edited the /mysite/_config.php
Translatable::set_default_locale('de_DE');
Object::add_extension('SiteTree', 'Translatable');
Object::add_extension('SiteConfig', 'Translatable'); // 2.4 or newer only

- Edited the first lines of /mysite/code/Page.php
<?php
class Page extends SiteTree {
private static $extensions = array(
"Translatable"
);

- Rebuild with /dev/build

- Worked fine without error, loggin into Admin site
- When i want to edit my sites, there is a dropdown menue showing a lot of languages, if i select one and click on go, the following error occured:

Action 'LangForm' isn't available on class CMSPagesController.

No matter which language i select. what did i wrong?

Thanks in advice :)

Hi,
I have exactly the same problem, though:
- I didn't rename the folder
- I used translatable 2.0.4

I had the same issue in 2.0.4, although I didn't have it on another installation where an older version was installed.

So then I compared, and I saw that in this new installation, I still had the folder as "silverstripe-translatable" while in the 'correctly working one' it was just "translatable" (NOT translateable). So, correcting the directory name and flushing fixed the issue for me, since that removed the button.

In any case, you don't really need that button, since the language is loaded as soon as you select it in the dropdown.