creating files for html section

translated version in new branch
translated css section to polish
translating section of images
Update scale.html.md

fix a typo
Update selectors.html.md

fix a typo
new files for js, jquery and bonus sections
new sections for server
adding intro files in polish
Merge remote-tracking branch 'origin/HEAD' into version-pl
translate html section into Chinese
translate css section into Chinese
translate js section into Chinese
translate jQuery section into Chinese
translate image section into Chinese
translate server section into Chinese
translate bonus section into Chinese
translate intro section into Chinese
change currentLang; bugs fix
hiding anchor link too
Merged #160