My plugin checks if a specific theme is activated. The check is hooked on init.

If the theme is not activated, it displays a warning, hooked on admin_notices.

This works fine.

Now I added localization support with the help of “Loco Translate” and .mo / .po files.

load_plugin_textdomainis hooked on init.

This works too, translations are showing up.

Now it gets weird:

My “Admin Notice” gets translated as expected, but only when opening wp-admin/plugins.php.
On any other backend-page the non-translated version appears.

My guess is it has something to do with the hook-order, but I can not figure out how to order the checks properly.

Some code, redacted for sanity:

<?php


namespace Me\MyPlugin;


class Bootstrapping
{

    public static function notifyOnMissingTheme(): void {

        if( ! self::ThemeIsActivated() ) {
            add_action('admin_notices', [self::class, '_echoThemeExistanceWarning']);
        }

    }

    public static function activateTranslationSupport() : void {
        load_plugin_textdomain( 'management-plugin', false, dirname(plugin_basename('__FILE__')) . '/languages');
    }


    private static function ThemeIsActivated(): bool
    {
        $theme = wp_get_theme();

        if (!('My themes name' == $theme->name || 'My themes name' == $theme->parent_theme) ) {
            return false;
        }

        return true;

    }


    static function _echoThemeExistanceWarning(): void {
        echo '<div class="notice notice-warning"><p>'. __('Notification from Plugin: Please activate the Theme for best experience with this plugin!', 'language-domain'). '</p></div>';
    }

}

<?php

/*
Plugin Name: Plugin
Text Domain: language-domain
Domain Path: /languages
*/

namespace Me/MyPlugin;


add_action('init', [Bootstrapping::class, 'activateTranslationSupport']);
add_action('init', [Bootstrapping::class, 'notifyOnMissingTheme']);

Thanks alot for your help!