Background of the issue:
I am trying to install WPML on a site under development after purchasing it.
Symptoms:
I receive the message: 'There is a problem with the String Translation table in your site.'
Questions:
What does the error message about the String Translation table mean?
How can I resolve the issue with the String Translation table during WPML installation?
1."X" out the warning and refresh the page
-> Does the warning remain after you close it and refresh the page?
2. Go to your database and verify that your database table wp_icl_strings exsits.
If it does please review the screenshot below and verify that the 'domain_name_context_md5' index field exists in both areas as seen highlighted in my screenshot.