-Fix bug in json valid

Simplify validation on language trans

Fix bug when dates are undef

Fix bug in jsonvalidator

Validation is displayed

Validation is displayed on upload and update survey

Return to previous version : removed JSON.stringify
new langtrans

fix JSON parser in upload json in zip

update init lang

fix path bug

New langdef  with swing label

fix some bug in find img. 
Rewriting URL when upload or clone
code cleaning

Not completely finished URL are not translated to new id

Zip download for survey and langtrans
Url verification for langtrans

This Version starts to integrate img upload download

- fix survey variable name
- new template variable

new template variables

Update language def for new variables

-Update survey model for new func
- Add language temp for retry

code cleaning

code cleaning

- Add advanced mode for creating token

- Answers in token are erased only if status is modified to new (not if it was new before)

* new variable file
* new README

Fix poc empty in surveymodel

Fix poc empty in surveymodel