Problem with crawlers

Using Transposh Versión 0.9.4.0

I’m having lot of errors in my apache log like this (differents values for original and lang) :

WordPress database error MySQL server has gone away for query SELECT * FROM wp_translations WHERE original = 'topic' and lang = 'uk' made by shutdown_action_hook, do_action('shutdown'), call_user_func_array, wp_ob_end_flush_all, ob_end_flush, transposh_plugin->process_page, parser->fix_html, call_user_func_array, transposh_database->fetch_translation

Also i have tons of requests from bots trying to translate all my multisite blogs completely

I have trying to disallow access through robots.txt

User-agent: *
Crawl-Delay: 60
Disallow: /wp-content/
Disallow: /wp-includes/
Disallow: /trackback/
Disallow: /wp-admin/
Disallow: /archives/
Disallow: /feeds/
Disallow: /category/
Disallow: /tag/*
Disallow: /tag/
Disallow: /wp-*
Disallow: /login/
Disallow: /*.js$
Disallow: /*.inc$
Disallow: /*.css$
Disallow: /*.php$
Disallow: /?lang=es$
Disallow: /?lang=af$
Disallow: /?lang=id$
Disallow: /?lang=ms$ …. (all langs)
Disallow: /es/
Disallow: /af/
Disallow: /id/
Disallow: /ms/ …. (all langs)

But nothing happens.

Now i must to deactivate the plugin, but I like it! I don’t want to delete it.

Any idea?

https://www.ads-software.com/plugins/transposh-translation-filter-for-wordpress/