The add-on incompatible with Russian language?

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I have built a site with multiple languages. This add-on works with all of them except Russian. Is there anything that can be done to fix it?

By installing the add-on, this error occurs:

Plural rule of merging text domain is not compatible with the current one

Type: Pre-Sale
Status: New
Olokko
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concrete5 Environment Information

# concrete5 Version
Core Version - 8.4.4
Version Installed - 8.4.4
Database Version - 20180717000000

# concrete5 Packages
Automatic Email Obfuscator (2.0.1), Background Image Slideshow (1.1.1), Buttons Factory Pro (3.0.6), C5Extras YouTube Channel (2.1.3), Call to Action Pro (1.0.0), Collage Gallery (0.9.0), Deluxe Customizable Twitter Feed (1.0.4), Devoda SEO (1.5.3), DiscussionES Facebook Comments (1.1), Event Calendar (3.4.1), Form Plus (2.4.0), Honest Websites Back To Top (1.1.0), HonestWebsites Store location (1.4.1), Image Link With Content (1.1), Info Box Grid (1.8), List files from set (1.0.13), Mega Menu (1.6.4), More Block Templates (0.9.6), Page password (0.9.3), Page Redirect (2.0), Page Selector Attribute (2.0), PDF Viewer (1.0.1), Responsive Embed (1.0.1), Ronyd Expanded Search Bar (2.0), Smooth Link Scrolling (1.2.2), Spacer (0.9.4), Stylish Ordered Lists (1.0), Supermint Theme (3.4.1.3), Touch Gallery 3 (3.2.4), Video Pro (1.0.0), Whale Elastic Slider (1.1.3), Whale OWL Carousel (2.5.8)

# concrete5 Overrides
controllers/1posting_api.php, controllers/concrete_api.php, controllers/posting_api_bk_2_26.php, controllers/posting_api.php, elements/header_required.php

# concrete5 Cache Settings
Block Cache - Off
Overrides Cache - Off
Full Page Caching - On - If blocks on the particular page allow it.
Full Page Cache Lifetime - Every 6 hours (default setting).

# Server Software
Apache/2.4.10 (Debian)

# Server API
apache2handler

# PHP Version
5.6.20-0+deb8u1

# PHP Extensions
apache2handler, bcmath, bz2, calendar, Core, ctype, curl, date, dba, dom, ereg, exif, fileinfo, filter, ftp, gd, gettext, hash, iconv, json, libxml, mbstring, memcached, mhash, mysql, mysqli, openssl, pcre, PDO, pdo_mysql, Phar, posix, readline, Reflection, session, shmop, SimpleXML, soap, sockets, SPL, standard, sysvmsg, sysvsem, sysvshm, tokenizer, wddx, xml, xmlreader, xmlwriter, Zend OPcache, zip, zlib

# PHP Settings
max_execution_time - 300
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 60
max_input_vars - 1000
memory_limit - 256M
post_max_size - 80M
sql.safe_mode - Off
upload_max_filesize - 40M
memcached.sess_lock_max_wait - 0
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
session.cache_limiter - <i>no value</i>
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5
opcache.max_accelerated_files - 2000
opcache.max_file_size - 0
opcache.max_wasted_percentage - 5

Browser User-Agent String

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36

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