The I18nTextReader (soon to be renamed I18nTextResourceHandler) matches too much :

"\{"

is replaced by

"{"

in every javascript file. It should only be matched/replaced when preceding an I18n declaration

"\{{i18n ".

Example : the ext-all-debug.js has

"\{"

in regex that is replaced with

"{"

, or string

"\\{1}"

which is replaced with

"\{1}"