Incorrect url paths at En version

[zakutnya]

Thanks for a handy tool, Julia!

I've noticed that language switcher urls on https://yoksel.github.io/url-encoder/ have incorrect values leading to 404, e.g.:

• «Br» leads to https://yoksel.github.io/pt instead of https://yoksel.github.io/url-encoder/pt/
• «Рус» leads to https://yoksel.github.io/ru instead of https://yoksel.github.io/url-encoder/ru/

and so on.

However pages in any language other than «En» contain correct urls («Br» leads to https://yoksel.github.io/url-encoder/pt/, etc.)