Change how updating a key works (#3072)

Before, to update a key from the reference language (en), the key was deleted
then created. This way was unproductive for all keys already translated.
Now, the key is updated in all untranslated languages.

See https://github.com/FreshRSS/FreshRSS/pull/3068#issuecomment-646868894

Makefile

@@ -125,8 +125,7 @@ endif
 ifndef value
 	$(error To update a key, you need to provide its value in the "value" variable)
 endif
-	@$(PHP) ./cli/manipulate.translation.php -a delete -k $(key)
-	@$(PHP) ./cli/manipulate.translation.php -a add -k $(key) -v "$(value)"
+	@$(PHP) ./cli/manipulate.translation.php -a add -k $(key) -v "$(value)" -l en
 	@echo Key updated.
 
 .PHONY: i18n-ignore-key

cli/i18n/I18nData.php

@@ -182,7 +182,16 @@ class I18nData {
 		    !array_key_exists($key, $this->data[static::REFERENCE_LANGUAGE][$this->getFilenamePrefix($key)])) {
 			throw new Exception('The selected key does not exist for the selected language.');
 		}
-		$this->data[$language][$this->getFilenamePrefix($key)][$key] = $value;
+		if (static::REFERENCE_LANGUAGE === $language) {
+			$previousValue = $this->data[static::REFERENCE_LANGUAGE][$this->getFilenamePrefix($key)][$key];
+			foreach ($this->getAvailableLanguages() as $lang) {
+				if ($this->data[$lang][$this->getFilenamePrefix($key)][$key] === $previousValue) {
+					$this->data[$lang][$this->getFilenamePrefix($key)][$key] = $value;
+				}
+			}
+		} else {
+			$this->data[$language][$this->getFilenamePrefix($key)][$key] = $value;
+		}
 	}
 
 	/**