localize composer toggler help text for zh_CN and zh_TW
cs translation update
cs translation update
extracting some hardcoded title="..." strings
Updated Dutch translation

Both server and client side, except for TOS.
putting "public/downloads" and "public/images" into .gitignore
extracting one more hardcoded title
Don't show sad face when version checks have not been done yet
Merge pull request #728 from ypxu/localize-help

localize composer toggler help text for zh_CN and zh_TW
Merge pull request #729 from kubabrecka/cs_update34

cs translation update client side
Merge pull request #730 from kubabrecka/cs_update35

cs translation update server side
Merge pull request #732 from kubabrecka/downloads_in_gitignore

putting "public/downloads" and "public/images" into .gitignore
Merge pull request #731 from kubabrecka/extract_titles

extracting some hardcoded title="..." strings
Merge pull request #734 from kubabrecka/extract_title1

extracting one more hardcoded title
Merge pull request #733 from sanderdatema/dutch_translation

Updated Dutch translation