As most English language words/word-groups do not have to be translated there is no new translation-file for en.
The old structure is used in . . /languages/lang.en.php
You should remove the typo by adding this to the end of the file:
$lang['Select langauge'] = 'Select language';
In all other language files (f.i. Dutch) it is
|Select langauge|Selecteer een taal|
On the left always the words from the scripts, on the right the translation.
Typing errors for the English words should be handled by the language files.
If you changes texts in the scripts as you did, the language files for the other languages will not find the correctly spelled words.
Wim