Facebook og locales

Updated Facebook supported locales list for og:locale. Update/compare 'inspired' by [this support forum thread](http://wordpress.org/support/topic/changing-locale-from-en_us-to-en_au).

I've created a small compare script which takes the official FB xml file as input + the array from the class.opengraph.php locale() function and compares these. If anyone if interested, drop me a line for a copy of the script.

**Current results: 1 new locale FB supported locale found & added, found 32 locales in the WP SEO list which are not in the FB list (not removed), 76 OK.**

The 32 which are in the WP SEO list, but not in FB list (and should may be be removed) are:
```php
//Returns an array containing all the entries from array1 that are not present in any of the other arrays.
array_diff( $fb_valid_fb_locales, $fb_current ) result:
```

```php
$diff = array (
	2 => 'ay_BO',
	9 => 'ck_US',
	20 => 'es_CL',
	21 => 'es_CO',
	24 => 'es_MX',
	25 => 'es_VE',
	29 => 'fb_FI',
	37 => 'gn_PY',
	38 => 'gu_IN',
	48 => 'jv_ID',
	50 => 'kk_KZ',
	52 => 'kn_IN',
	56 => 'li_NL',
	59 => 'mg_MG',
	62 => 'mn_MN',
	63 => 'mr_IN',
	65 => 'mt_MT',
	68 => 'nl_BE',
	76 => 'qu_PE',
	77 => 'rm_CH',
	80 => 'sa_IN',
	81 => 'se_NO',
	84 => 'so_SO',
	89 => 'sy_SY',
	92 => 'tg_TJ',
	95 => 'tl_ST',
	97 => 'tt_RU',
	99 => 'ur_PK',
	100 => 'uz_UZ',
	102 => 'xh_ZA',
	103 => 'yi_DE',
	107 => 'zu_ZA',
);
```