Option to use login password as SALT key

In the environment where I use TeamPass is more important the usability than security so we decided to implement the option to use login password as salt key by default.

Now if the personal folders are enabled the user can put and read passwords without setting the saltkey (is setted the login one)

This pull request also include the option to enable/disable this in the settings to enable this feature and the translation in English and Spanish of the string.

It the users has used saltkeys previowsly they should migrate to loginpassword before the administrator enables this feature.

This also tested with LDAP integration and works fine.