Fix multiple bugs : undefined vars, incorrect condition, SSL/TLS config

[tgrevillot]

Hey Processus !
I was trying to implement it by myself but I noticed some bugs, here is a quick sum up of problems detected and fixed :

• Undefined variables in functions : probably a mismatch between arguments name and variables in core content
• Admin check condition : var type problem, comparison between string and id --> often false.
• Discord BOT : Send a message "Starting scraping" in the discord channel as this operation could take some times
• Email configuration : Now supporting email tls and ssl feature. Tested with a mail provider using tls, but not with ssl.

Waiting for your feedback, have a nice day !