Renamed files, and translated to english, fixed charts

- index, data-filtered-brief, data-filtered-all, charts have been
renamed and translated
- charts code has been cleaned and fixed
Renamed settings.tabUnites to settings.tabUnits
Added fixed-point representation settings, fixed tooltip bug in charts

- added settings.tabFixedPoint in settings.js to handle fixed-point
representation of field values
- charts and data-filtered-* have been updated to take it into
account
- date bug (timestamp instead of formatted time) has been fixed
Fixed a broken link in charts.html