Add new translate action: `move`, `make i18n-move-key` (#8214)

So that renaming something like `conf.shortcut.toggle_sidebar` to `conf.shortcut.toggle_aside` can be done easily even after already having added `conf.shortcut.toggle_sidebar` and translated it in multiple languages.

Example of usage:
```console
./cli/manipulate.translation.php -a move -k conf.shortcut.toggle_sidebar -n conf.shortcut.toggle_aside
```
```console
make i18n-move-key key="conf.shortcut.toggle_sidebar" new-key="conf.shortcut.toggle_aside"
```

The key will be moved and all values/states will be kept.

1 files changed, 12 insertions, 2 deletions

diff --git a/tests/cli/i18n/I18nDataTest.php b/tests/cli/i18n/I18nDataTest.php
index 02ad7ea9a..5533ce166 100644
--- a/tests/cli/i18n/I18nDataTest.php
+++ b/tests/cli/i18n/I18nDataTest.php
@@ -34,6 +34,16 @@ final class I18nDataTest extends \PHPUnit\Framework\TestCase {
 		];
 	}
 
+	public function testMoveKey(): void {
+		$data = new I18nData($this->referenceData);
+		$value = $data->getData()['en']['file2.php']['file2.l1.l2.k2'];
+		self::assertTrue($data->isKnown('file2.l1.l2.k2'));
+		self::assertFalse($data->isKnown('file2.l1.nkl2'));
+		$data->moveKey('file2.l1.l2.k2', 'file2.l1.nkl2');
+		self::assertFalse($data->isKnown('file2.l1.l2.k2'));
+		self::assertTrue($data->isKnown('file2.l1.nkl2'));
+	}
+
 	public function testConstructWhenReferenceOnly(): void {
 		$data = new I18nData($this->referenceData);
 		self::assertSame($this->referenceData, $data->getData());
@@ -302,7 +312,7 @@ final class I18nDataTest extends \PHPUnit\Framework\TestCase {
 
 	public function testAddLanguageWhenLanguageExists(): void {
 		$this->expectException(\Exception::class);
-		$this->expectExceptionMessage('The selected language already exist.');
+		$this->expectExceptionMessage('The selected language already exists.');
 		$data = new I18nData($this->referenceData);
 		$data->addLanguage('en');
 	}
@@ -430,7 +440,7 @@ final class I18nDataTest extends \PHPUnit\Framework\TestCase {
 
 	public function testAddKeyWhenKeyExists(): void {
 		$this->expectException(\Exception::class);
-		$this->expectExceptionMessage('The selected key already exist.');
+		$this->expectExceptionMessage('The selected key already exists.');
 		$data = new I18nData($this->referenceData);
 		$data->addKey('file2.l1.l2.k1', 'value');
 	}