App update

Submodule web/app e8c4c20..28cc2df:
  > Change msg to message for return functions
  > SQL queries refactoring
  > Rename t to side in the get_tenprint_template_zones() function
  > Refactoring the SQL query in the config_new_user_donor() function
  > Type
  > Add the DEK salt removal in the doc
  > Remove useless variables to render submission/template.html
  > Refactoring t to side
  > Remove the GET method for the upload_file() endpoint
  > Use the config.all_fpc instead of redifining the data inline
  > Move the configuration of the random_data length to the config file
  > Rename the "t" variable to "side" in the do_image_tenprint_segmentation() function
  > Change the error log and returned message on donor email reuse
  > Add comment for the supplementary action needed by template_tenprint_new_uploadimage() if no resolution is present in the image
  > Refactoring: Rename the h and w variables in the update_tp_template_var() function
  > Patch the variable name in the tenprint template edit page
  > Typo
  > Refactoring: rename the variable "face" to "side"
  > Refactoring of the image_tp_template() function
  > Add logging error if the DEK check test is not ok
  > Check the presence of the salt to regenerate the donor DEK
  > Return a "no preview" image if the tenprint template image is not available
  > Move the creation of the "no preview" image to the functions.py file
  > Patch the tp_template/new_images.html file, url_for template_tenprint with wrong arguments
  > Patch: Return the id of the tenprint template in the template_tenprint_new_do() function
  > Add docstrings