Add This field is missing RU translation

<source>This field is missing.</source>
Have no translation. Not exists in EN version too. Just forgotten? 
Symfony\Component\Validator\Constraints\Collection()
public $missingFieldsMessage = 'This field is missing.';
merged branch fabpot/moved_validator_4 (PR #7784)

This PR was merged into the 2.1 branch.

Discussion
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Add This field is missing RU translation

This PR was submitted on the symfony/Validator read-only repository and moved automatically to the main Symfony repository (closes symfony/Validator#4).

<source>This field is missing.</source>
Have no translation. Not exists in EN version too. Just forgot? 
Symfony\Component\Validator\Constraints\Collection()
public $missingFieldsMessage = 'This field is missing.';

Commits
-------

97c4291 Add This field is missing RU translation
Rename misprint property (from warmer to finder)
merged branch alexpods/patch-1 (PR #7837)

This PR was submitted for the master branch but it was merged into the 2.1 branch instead (closes #7837).

Discussion
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Rename misprint property (from warmer to finder)

Commits
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a1f5bd5 Rename misprint property (from warmer to finder)
[Process] Fix #5594 : `termsig` must be used instead of `stopsig` in exceptions when a process is signaled
merged branch romainneutron/termsig (PR #7865)

This PR was merged into the 2.1 branch.

Discussion
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[Process] Fix #5594 : `termsig` must be used instead of `stopsig` in exceptions when a process is signaled

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #5594
| License       | MIT

When a process is signaled, an exception is thrown saying `The process has been signaled with signal "0".`. This is wrong because "0" is not a signal.

This is actually a bug in `Process` because we retrieve the `stopsig` property of the process status whereas we should retrieve the `termsig`.

`stopsig` should be retrieved in case the process has been stopped, and `termsig` when it has been signaled, see [PHP documentation](http://www.php.net/manual/en/function.proc-get-status.php).

Commits
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8757ad4 [Process] Fix #5594 : `termsig` must be used instead of `stopsig` in exceptions when a process is signaled
[BrowserKit] fixed BC break done recently
merged branch fabpot/cookies (PR #7879)

This PR was merged into the 2.1 branch.

Discussion
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[BrowserKit] fixed BC break done recently

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

This PR tries to avoid a BC break that was introduced recently in the management of cookies (see #7738).

see fabpot/Silex#684

Commits
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25b8b84 [BrowserKit] fixed BC break done recently
Merge branch '2.1' into 2.2

* 2.1:
  [BrowserKit] fixed BC break done recently
  [Process] Fix #5594 : `termsig` must be used instead of `stopsig` in exceptions when a process is signaled
  Rename misprint property (from warmer to finder)
  Add This field is missing RU translation

Conflicts:
	src/Symfony/Component/Process/Process.php
	src/Symfony/Component/Validator/Resources/translations/validators.ru.xlf