Update README_PL.md

Polish programmers often use English names for things, so they are worth adding in brackets since they are translated poorly here. I also fixed some obvious mistakes in translation and removed word “webmaster” - who on earth still uses it?
Merge pull request #50 from pim/patch-1

Update README_PL.md
Renamed French translation, WIP
Fixes spelling and semantics of the Portuguese
Culling bad questions.

Trivia-y ones that don't speak well to candidates experience. Or just old.

This needs more mobile-focused questions, and performance coverage.
Merge pull request #51 from shankarcabus/master

Fixes spelling and semantics of the Portuguese
Swedish spelling corrections
Merge pull request #53 from wibron/swedish-patch

Swedish spelling corrections
Hungarian translation
Some questions added to Russian.
Merge pull request #55 from microtroll/master

Hungarian translation
updated to 2.0.0
Merge pull request #57 from msval/Croatian

Update Croatian Questions to v2.0.0
Merge pull request #56 from vdv73rus/russian_addons

Some questions added to Russian.
create Traditional Chinese version.

Signed-off-by: Hank Wang <drapho@gmail.com>
Added Dutch translation
Fixed one translation and moved to branch in order to make a pull request
Commit some questions about javascipt.
Merge pull request #62 from Graybobo/master

Commit some questions about javascipt.
Merge pull request #61 from gerbenjacobs/dutch-branch

Dutch branch