Bug 11365: (follow-up) trim whitespace in the translate_card_element block

Bug 11365: (follow-up) trim whitespace in the translate_card_element block

Trim leading and trailing whitespace in the text generated
by the translate_card_element block to avoid generating
unescaped multi-line strings, which breaks the JavaScript

To test:

[1] Test actions in the patron card creator that generate
    JavaScript alerts, such as hitting the delete button
    without first selecting a batch or profile.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>