Missing validation sentence for timezone.

When using the timezone validation, it does not have a default sentence, you are greeted with: "validation.timezone" instead.
Add missing 'reminders.reset' message.
Add type 'project' to composer.json

That is what is suggested by https://getcomposer.org/doc/04-schema.md#type
Merge pull request #2971 from barryvdh/patch-3

Add type 'project' to composer.json
Merge pull request #2964 from cjaoude/master

Add missing 'reminders.reset' message.
Merge pull request #2960 from josezenem/master

Missing validation sentence for timezone.
Merge remote-tracking branch 'upstream/master'