Add language after installation

Hi
is it possible to change Drupal language after installation? I have installed Drupal without any additional language. Now I don't know how to add some language. I have added .po file in /profiles/standard/translations folder but it didn't help. I haven't even "admin/config/regional/language" link to change or set language.
Can anybody help?
thanks
Tomas

What is possible with...

Hello,

I would like to create my new project with Drupal 7. Well I am new to Drupal and am not sure which module is able to do what I need and which one I need to develope.

Project Description:
Here is graphical overview.
http://web511.server100.greatnet.de/concept.html

What commerce module should I use?

Basically I own an IT company. I would like my customers to be able to setup an account on my website and be able to pay for the work my technicians have completed. What would be the best commerce module to accomplish this. Say a technician completed a job and the cost is $300.00 I would like to log in my site and charge there account $300. They can log in and pay. Then the system should send out a invoice to their email. If they haven't paid in a certain amount of time it should let us know and also send out another invoice.

How to get a form to submit

I have a form that needs to be submitted directly to the database. It is a small profile module for artists that allows the artist to enter info. It has its own database table named after my module 'artistfield'.
I have tried this though when you click the submit button nothing happens.
How do you get the submit button to submit the data?

function artistfield_profile_form(){
$mark ='

';
$form['name'] = array(
'#type' => 'textfield',
'#prefix' => $mark,
'#title' => t('Stage Name'),
'#default_value' => variable_get('artistfield_name', 'none'),
'#size' => 60,
'#maxlength' => 150,
'#description' => t('Your stage name - if multiple seperate with commas'),
'#required' => TRUE,
);
$form['description'] = array(
'#type' => 'textarea',
'#cols' => 60,
'#rows' => 5,
'#title' => t('Short description'),
'#description' => t('Short rave about yourself'),
'#required' => TRUE,
);
$form['instruments'] = array(
'#type' => 'textfield',
'#prefix' => $mark,
'#title' => t('Stage Name'),
'#default_value' => variable_get('artistfield_instruments', 'none'),
'#size' => 60,
'#maxlength' => 255,
'#description' => t('Add your instruments without caps with a comma between each one'),
'#required' => TRUE,
);
$form['age'] = array(

Strange error with css file

I am trying to add a new field that has a javascript slider.
The weird issue I am coming up with is whenever I add the css file to my .info file the javascript throws a syntax error with this css

.dynamic-slider-control {

Anyone have any ideas why this would happen?

Tabs Class

Anybody knows how to change the classes for each tab?
Because i'd like to have different tabs, for examble "edit" must be in one way and "view" or "devel" in another way...

thanks.

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