found your issue specific to your mysql and I should be able to alter the install for that.
You had a mixture of collations some tables utf8_general and come utf8_unicode.
Had not known exactly whether you had done an install upgrade etc last time I probally ran through the last couple upgrades and reimported phrases and saw your issue was fixed.
Running the affected query in phpmyadmin first I was able to see what your specific issue was and why I was able to install with no issues. Your specific mysql probally has locked down to work with one specific collation across tables.