Switched to dev mode and now can't access the site:
Parse error: syntax error, unexpected ''miles fr' (T_ENCAPSED_AND_WHITESPACE) in public_html/amigote.com/ow_pluginfiles/base/lang_1.php
I dont believe that error has anything to do with dev mode, you have a php parse error. Whatever you are trying to change or edit, you did it wrong and there is an error.
Seems like the array of values have a syntax error