Updating source texts according to fixes on en_US catalog

However, this cannot prevent heuristics by Google Chrome.

Limit personalization: Only when posted from WWSympa, entire text will be converted. Otherwise only footer/header will be converted.

* Merge @Sympa::ConfDef::params into %Sympa::ListDef::pinfo
* Merge %Conf::old_params into %Sympa::ListDef::pinfo
* Add aliases of parameter names for compatibility to sympa.conf/robot.conf of earlier versions.
* Move content of Sympa::ListDef to Sympa::Config::Schema
* Move content of Sympa::ConfDef to Sympa::Config::Schema
* Defining additional format entries in config schema.
* Merge sympa.conf(5) and list_config(5) into sympa_config(5).

Updating source texts according to fixes on en_US catalog

family_signoff action no longer does use one-time ticket.

WWSympa: edit_list: Use 'Apply modifications' instead of 'Update' to make sure the changes/deletions will be effective only if update is performed.

WWSympa: editsubscriber/review/set: Use 'Apply modifications' instead of 'Update' to make sure the changes/deletion will be effective only if update is performed.

WWSympa: edit: Use 'Apply modifications' instead of 'Update' to make sure the changes/deletion will be effective only if update is performed.

Fix #634

Fix #636

Fix #622
Thx to dpc22 who created the issue AND gave the solution

- Currently, only light export is available, thus export doesn’t contain
  the name of the subscribers. The button solves that.
- The full export always includes a header:
  # Exported subscribers with search filter ""
  But it’s useless and maybe confusing when you use the full export from
  the button. I removed that header if no filter was sent.

Note: Message catalog should be tweaked.

Note: Message catalog should be tweaked.