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I don't know of a plugin that allows you to do this out of the box, but as you are (/seem to be) comfortable with database manipulation, I've outline below how you can achieve what you want using custom coding.
You can run custom queries using the wpdb-class. There are a few posts on WPSE/SO that treat this. Once you've set those up, you can run them on, ...
1
You're missing your where statement. You need to tell wpdb which row it should be updating, otherwise you're looking to insert rather than update.
From the $wpdb::update Codex:
wpdb->update( string $table, array $data, array $where, array|string $format = null, array|string $where_format = null );
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You can get the last inserted ID from $wpdb with the insert_id property:
$wpdb->insert( ... );
$couponId = $wpdb->insert_id
1
Add this to functions.php
add_action('wp_ajax_post_language','post_language');
and then make either of following changes in your code.
Because your jquery code is sending FirstNM to server (not FirstName).
Therefore in post_language() function, change this line
$FirstName = isset( $_POST['FirstName'] ) ? $_POST['FirstName'] : '';
to
$FirstName ...
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