4 files changed, 38 insertions, 4 deletions

diff --git a/app/CMakeLists.txt b/app/CMakeLists.txt
index 824e107..c25efe8 100644
--- a/app/CMakeLists.txt
+++ b/app/CMakeLists.txt
@@ -27,6 +27,8 @@ target_link_libraries("app" PUBLIC
   "PkgConfig::adwaita"
   "PkgConfig::gtkmm"
 
+  "turns::lang"
+
   "$<$<CXX_COMPILER_ID:GNU,Clang>:-Wl,--whole-archive>"
   "turns::res"
   "$<$<CXX_COMPILER_ID:GNU,Clang>:-Wl,--no-whole-archive>"
diff --git a/app/src/main.cpp b/app/src/main.cpp
index dd23c82..d7fadc7 100644
--- a/app/src/main.cpp
+++ b/app/src/main.cpp
@@ -1,9 +1,15 @@
 #include "turns/app/application.hpp"
 
 #include <adwaita.h>
+#include <glibmm/i18n.h>
 
 auto main(int argc, char * argv[]) -> int
 {
+  setlocale(LC_ALL, "");
+  bindtextdomain("turns", LOCALEDIR);
+  bind_textdomain_codeset("turns", "UTF-8");
+  textdomain("turns");
+
   adw_init();
 
   auto app = turns::app::application::create();
diff --git a/app/src/windows/main.cpp b/app/src/windows/main.cpp
index f8437a6..0000f60 100644
--- a/app/src/windows/main.cpp
+++ b/app/src/windows/main.cpp
@@ -1,6 +1,7 @@
 #include "turns/app/windows/main.hpp"
 
 #include <adwaita.h>
+#include <glibmm/i18n.h>
 
 namespace turns::app::windows
 {
@@ -10,7 +11,7 @@ namespace turns::app::windows
       , m_adw{ADW_APPLICATION_WINDOW(gobj())}
       , m_title(ADW_WINDOW_TITLE(builder->get_widget<Gtk::Widget>("title")->gobj()))
   {
-    adw_window_title_set_subtitle(m_title, "No active turn-order");
+    adw_window_title_set_subtitle(m_title, _("No active turn-order"));
   }
 
 }  // namespace turns::app::windows
\ No newline at end of file
diff --git a/app/tests/windows/main.cpp b/app/tests/windows/main.cpp
index d2ad60e..53c9386 100644
--- a/app/tests/windows/main.cpp
+++ b/app/tests/windows/main.cpp
@@ -1,20 +1,24 @@
 #include "turns/app/windows/main.hpp"
 
 #include <catch2/catch_test_macros.hpp>
+#include <catch2/generators/catch_generators.hpp>
 
 #include <string>
 
 #include <adwaita.h>
+#include <glibmm/i18n.h>
+#include <glibmm/ustring.h>
 #include <gtkmm/builder.h>
 #include <gtkmm/widget.h>
 
-using namespace std::string_literals;
-
 namespace turns::app::windows::tests
 {
 
   TEST_CASE("Newly constructed main window", "[windows]")
   {
+    auto locale = GENERATE("en_US.UTF-8", "de_CH.UTF-8");
+    setlocale(LC_ALL, locale);
+
     auto builder = Gtk::Builder::create_from_resource("/turns/windows/main_window.ui");
     auto instance = Gtk::Builder::get_widget_derived<main>(builder, "main_window");
 
@@ -23,11 +27,32 @@ namespace turns::app::windows::tests
       REQUIRE(instance);
     }
 
+    SECTION("the window sub-title is not empty")
+    {
+      auto widget = builder->get_widget<Gtk::Widget>("title");
+      auto adw = ADW_WINDOW_TITLE(widget->gobj());
+      REQUIRE(adw_window_title_get_subtitle(adw));
+    }
+
+    SECTION("the window sub-title is set according to the active language")
+    {
+      auto widget = builder->get_widget<Gtk::Widget>("title");
+      auto adw = ADW_WINDOW_TITLE(widget->gobj());
+      REQUIRE(adw_window_title_get_subtitle(adw) == Glib::ustring{_("No active turn-order")});
+    }
+
     SECTION("the window title is not empty")
     {
       auto widget = builder->get_widget<Gtk::Widget>("title");
       auto adw = ADW_WINDOW_TITLE(widget->gobj());
-      REQUIRE(adw_window_title_get_subtitle(adw) != ""s);
+      REQUIRE(adw_window_title_get_title(adw));
+    }
+
+    SECTION("the window title is set according to the active language")
+    {
+      auto widget = builder->get_widget<Gtk::Widget>("title");
+      auto adw = ADW_WINDOW_TITLE(widget->gobj());
+      REQUIRE(adw_window_title_get_title(adw) == Glib::ustring{_("Turns")});
     }
   }