Update ru plugin
For the Russian language, an update was made, but in reality, a file named "free_ebook.txt" was added, containing two formatted pages from Russian classic literature, specifically, the work "Crime and Punishment."
The file "database_ru.db" was also updated. It was generated using the following commands:
text2ngram -n 1 -l -f sqlite -o $PWD/database_ru.db $PWD/free_ebook.txt && \
text2ngram -n 2 -l -f sqlite -o $PWD/database_ru.db $PWD/free_ebook.txt && \
text2ngram -n 3 -l -f sqlite -o $PWD/database_ru.db $PWD/free_ebook.txt