Yii2 Translate Manager doesn't work - php

Question

I m using a basic template for a small project on Yii2. I have already set the module Language Picker of Lajax (Doc) and I am trying now to manage the translation with the module Translate Manager of Lajax (Github). The plugin is scanning perfectly the project and getting the translatable texts. I even set some translations through this module and everything is saved in the database, but these translations are not set when changing the language.
here are my web.php Configurations:
'language' => 'en-GB',
'components' => [
...
'languagepicker' => [
'class' => 'lajax\languagepicker\Component',
'languages' => ['en-GB', 'fr-FR']
],
'i18n' => [
'translations' => [
'*' => [
'class' => 'yii\i18n\DbMessageSource',
'db' => 'db',
'sourceLanguage' => 'en-GB',
'sourceMessageTable' => '{{%language_source}}',
'messageTable' => '{{%language_translate}}',
'forceTranslation' => true,
'cachingDuration' => 86400,
'enableCaching' => true,
],
],
],
...
]
'modules' => [
...
'translatemanager' => [
'class' => 'lajax\translatemanager\Module',
'root' => '#app', // The root directory of the project scan.
'scanRootParentDirectory' => false, // Whether scan the defined `root` parent directory, or the folder itself.
// IMPORTANT: for detailed instructions read the chapter about root configuration.
'layout' => 'language', // Name of the used layout. If using own layout use 'null'.
'allowedIPs' => ['127.0.0.1'], // IP addresses from which the translation interface is accessible.
'roles' => ['#'], // For setting access levels to the translating interface.
'tmpDir' => '#runtime', // Writable directory for the client-side temporary language files.
// IMPORTANT: must be identical for all applications (the AssetsManager serves the JavaScript files containing language elements from this directory).
'phpTranslators' => ['::t'], // list of the php function for translating messages.
'jsTranslators' => ['lajax.t'], // list of the js function for translating messages.
'patterns' => ['*.js', '*.php'],// list of file extensions that contain language elements.
'ignoredCategories' => ['yii'], // these categories won't be included in the language database.
'ignoredItems' => ['config'], // these files will not be processed.
'scanTimeLimit' => null, // increase to prevent "Maximum execution time" errors, if null the default max_execution_time will be used
'searchEmptyCommand' => '!', // the search string to enter in the 'Translation' search field to find not yet translated items, set to null to disable this feature
'defaultExportStatus' => 1, // the default selection of languages to export, set to 0 to select all languages by default
'defaultExportFormat' => 'json',// the default format for export, can be 'json' or 'xml'
'tables' => [ // Properties of individual tables
[
'connection' => 'db', // connection identifier
'table' => '{{%language}}', // table name
'columns' => ['name', 'name_ascii'],// names of multilingual fields
'category' => 'database-table-name',// the category is the database table name
]
],
'scanners' => [ // define this if you need to override default scanners (below)
'\lajax\translatemanager\services\scanners\ScannerPhpFunction',
'\lajax\translatemanager\services\scanners\ScannerPhpArray',
'\lajax\translatemanager\services\scanners\ScannerJavaScriptFunction',
'\lajax\translatemanager\services\scanners\ScannerDatabase',
],
],
...
]
I always use something like this im code for translatable strings:
<?= Yii::t('app','Test') ?>
Am I doing something wrong?