Upgrade composer.lock deps

See merge request framasoft/framadate/framadate!398

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

fix(create_poll): don't send emails in case of DB transaction errors

See merge request framasoft/framadate/framadate!384

Extract poll update notification mails into smarty templates

See merge request framasoft/framadate/framadate!390

Cleanup/dependencies

See merge request framasoft/framadate/framadate!397

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

[Big] Move displaying dates from libc to PHP-intl / ICU

See merge request framasoft/framadate/framadate!396

* Make sure we always work only with DateTimes
* Support slots again under SQLite
* Small fixes

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

This commit adds an error message in the STEP 3 of the poll creation
form in case there is a DB transactions error.

It also makes sure to not send emails in case of those DB transaction
errors.

Add diff option to the linter to see errors/fixes

See merge request framasoft/framadate/framadate!394

Refactorisation of the creation poll service

See merge request framasoft/framadate/framadate!383

Use Symfony/Translation and use the .po files directly in the repo and app

See merge request framasoft/framadate/framadate!389

The msgid actually used in yyyy-mm-dd-for-humans, not year-month-day.

The last confirmation step during poll creation flow is identical
between date polls and classical polls.

This commit moves the code in the `PollService` to be used in both
creation poll controllers.

The `use_smtp` configuration key really means: Are emails enabled?

Indeed the 'smtp' naming is here for legacy reasons. (cf #425)

Instead of manually removing entries in the SESSION object, let the
SessionService do the work in creating poll controllers.

The last action of creatin a poll is the same code between classical
and date polls.

This commit backports the minor refactoring to have the exact same
code.

(done with ediff to make sure the code was similar)

* Use the actually found locale for $locale in the rest of the app

* Use the DEFAULT_LANGUAGE as the default in locale_lookup.
* Initialise the translators explicitly.

Use the DEFAULT_LANGUAGE as the default in locale_lookup.

* remove useless is_string check
* use the DEFAULT_LANGUAGE when Accept-Language is invalid.

Reimplement the __() and __f() functions using Symfony.

ci: some cleanup of the gitlab-ci file and testing migrations on MySQL

See merge request framasoft/framadate/framadate!388

This commit splits the `test` job into three separate jobs:
- test
- lint
- db:migrate

It also factorise some code, and remove useless use of git checkout

Update pot after !387

See merge request framasoft/framadate/framadate!392

(also make sure it's pushed to Zanata)

Signed-off-by: Thomas Citharel <tcit@tcit.fr>