public function getKeysExistingInALanguageButNotTheOther($values)
    {
        $missing = [];

        // Array of keys indexed by fileName.key, those are the keys we looked
        // at before so we save them in order for us to not look at them
        // again in a different language iteration.
        $searched = [];

        // Now we add keys that exist in a language but missing in any of the
        // other languages. Those keys combined with ones with values = ''
        // will be sent to the console user to fill and save in disk.
        foreach ($values as $key => $value) {
            list($fileName, $languageKey, $key) = explode('.', $key, 3);

            if (in_array("{$fileName}.{$key}", $searched)) {
                continue;
            }

            foreach ($this->languages() as $languageName) {
                if (! Arr::has($values, "{$fileName}.{$languageName}.{$key}") && ! array_key_exists("{$fileName}.{$languageName}.{$key}", $values)) {
                    $missing[] = "{$fileName}.{$key}:{$languageName}";
                }
            }

            $searched[] = "{$fileName}.{$key}";
        }

        return $missing;
    }