Add more client-side validation

[quantumlicht]

convert type for
alcool ,prix

limit number of selected encepagement
make sure all text field don't contain numbers

[quantumlicht]

strip all white spaces. use proper tag escaping functions
strip white spaces in code saq.

[quantumlicht]

remove possible "," from prix and alcool, replace with "."

[quantumlicht]

check if the username already exists in the database. make ajax call to a model, passing the requested username and after we query the db to find a match and the ajax response will be a boolean.

[quantumlicht]

check that no more than 5 cepage are selected

[quantumlicht]

limit number of tags that can be submitted by user

[quantumlicht]

We need to capitalize the tags that are submitted.