you need to apply the crop first

and how this would localize the text?

what text? you need to apply the crop selection

please read the topic name - "Not localized"
the bug is in localization
this is not a question on how to use the feature

What bug, provide a screenshot, elaborate the problem?It's hard to understand you. 

Switch to another language and try to translate the text of the error.

or ask a developer to explain you what does it mean "Not localized error"

in /ow_system_plugins/base/controllers/avatar.php

find function crop

after this line: 

 OW::getDocument()->addScript($staticJsUrl . 'crop_avatar.js');

add this line:

   OW::getLanguage()->addKeyForJs('base', 'crop_msg');

then go to :

/ow_static/plugins/base/js/crop_avatar.js

replace alert at the bottom of the code with this one: 

alert(OW.getLanguageText('base', 'crop_msg'));

then go to the admin panel/language section

switch to the dev www.yoursite.com/admin/dev-tools/languages

click on add new text

choose base as a section

key is crop_msg

and your translation. 

Then enable dev mode and refresh your website, clear browser cache. 

Next time, please provide more detailed information in your request if you want to get effective assistance on our part.