Merge branch 'develop' into feature/PTBAS-741_mappingDialogAdjustment

# Conflicts:
#	src/main/java/de/doubleslash/keeptime/controller/HeimatController.java
#	src/main/java/de/doubleslash/keeptime/view/ExternalProjectsSyncController.java
#	src/main/java/de/doubleslash/keeptime/viewpopup/SearchCombobox.java
#	src/test/java/de/doubleslash/keeptime/controller/HeimatControllerTest.java

Author: Death111

src/main/java/de/doubleslash/keeptime/App.java

@@ -21,6 +21,7 @@
 import java.io.StringWriter;
 import java.time.LocalDate;
 import java.util.List;
+import java.util.Locale;
 import java.util.Optional;
 import java.util.stream.Collectors;
 
@@ -84,6 +85,9 @@ public class App extends Application {
    @Override
    public void init() throws Exception {
       LOG.info("Starting KeepTime.");
+
+      setLocaleToEnglish();
+
       final DefaultExceptionHandler defaultExceptionHandler = new DefaultExceptionHandler();
       defaultExceptionHandler.register();
 
@@ -102,6 +106,22 @@ public void init() throws Exception {
       model.setSpringContext(springContext);
    }
 
+   private void setLocaleToEnglish() {
+      final Locale systemDefaultLocale = Locale.getDefault();
+      final Locale wantedApplicationLocale = Locale.ENGLISH;
+
+      if (systemDefaultLocale.getLanguage().equals(wantedApplicationLocale.getLanguage())) {
+         LOG.debug("Application locale already is '{}'. Nothing to do.", wantedApplicationLocale);
+         return;
+      }
+
+      LOG.info("Setting application locale to '{}', was '{}'.", wantedApplicationLocale, systemDefaultLocale);
+      Locale.setDefault(wantedApplicationLocale);
+      Locale.setDefault(Locale.Category.DISPLAY, wantedApplicationLocale);
+      // keep system locale for format conversions (date, currency, numbers)
+      Locale.setDefault(Locale.Category.FORMAT, systemDefaultLocale);
+   }
+
    @Override
    public void start(final Stage primaryStage) {
       LOG.info("Initialising the UI");
@@ -117,12 +137,13 @@ public void start(final Stage primaryStage) {
       }
    }
 
-   public static void showErrorDialogAndWait(String title, String header, String content, final Exception e, Window window) {
+   public static void showErrorDialogAndWait(String title, String header, String content, final Exception e,
+         Window window) {
       final Alert alert = new Alert(AlertType.ERROR);
       alert.setTitle(title);
       alert.setHeaderText(header);
       alert.setContentText(content);
-      if(window != null) {
+      if (window != null) {
          alert.initOwner(window);
       }
       final StringWriter sw = new StringWriter();

src/main/java/de/doubleslash/keeptime/controller/HeimatController.java

@@ -0,0 +1,70 @@
+// Copyright 2025 doubleSlash Net Business GmbH
+//
+// This file is part of KeepTime.
+// KeepTime is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+package de.doubleslash.keeptime.model;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Represents a styled text message composed of multiple text segments. This class provides a UI-agnostic way to
+ * represent formatted text, allowing separation of business logic from UI components.
+ */
+public class StyledMessage {
+
+   /**
+    * Represents a single text segment with optional styling.
+    *
+    * @param text
+    *       The text content
+    * @param bold
+    *       Whether the text should be displayed in bold
+    */
+   public record TextSegment(String text, boolean bold) {
+      public TextSegment(String text) {
+         this(text, false);
+      }
+   }
+
+   private final List<TextSegment> segments;
+
+   public StyledMessage(List<TextSegment> segments) {
+      this.segments = new ArrayList<>(segments);
+   }
+
+   /**
+    * Creates a StyledMessage from a variable number of text segments.
+    *
+    * @param segments
+    *       The text segments to include in the message
+    * @return A new StyledMessage containing the provided segments
+    */
+   public static StyledMessage of(TextSegment... segments) {
+      return new StyledMessage(List.of(segments));
+   }
+
+   public List<TextSegment> getSegments() {
+      return new ArrayList<>(segments);
+   }
+
+   /**
+    * Returns the message as plain text without styling.
+    */
+   public String toPlainText() {
+      return segments.stream().map(TextSegment::text).reduce("", String::concat);
+   }
+}
+

src/main/java/de/doubleslash/keeptime/model/StyledMessage.java

@@ -24,7 +24,7 @@
 import de.doubleslash.keeptime.model.Project;
 import de.doubleslash.keeptime.rest.integration.heimat.model.ExistingAndInvalidMappings;
 import de.doubleslash.keeptime.rest.integration.heimat.model.HeimatTask;
-import de.doubleslash.keeptime.viewpopup.SearchPopup;
+import de.doubleslash.keeptime.viewpopup.SearchCombobox;
 import javafx.application.Platform;
 import javafx.beans.property.SimpleBooleanProperty;
 import javafx.beans.property.SimpleObjectProperty;
@@ -142,7 +142,7 @@ protected void updateItem(String item, boolean empty) {
       TableColumn<HeimatController.ProjectMapping, HeimatTask> externalColumn = new TableColumn<>("HEIMAT project");
       externalColumn.setCellValueFactory(data -> new SimpleObjectProperty<>(data.getValue().getHeimatTask()));
       externalColumn.setCellFactory(col -> new TableCell<>() {
-         private final SearchPopup<HeimatTask> searchPopup = new SearchPopup<>(externalProjectsObservableList);
+         private final SearchCombobox<HeimatTask> searchPopup = new SearchCombobox<>(externalProjectsObservableList);
 
          {
             searchPopup.setDisplayTextFunction(ht -> ht == null ? "" : ht.taskHolderName() + " - " + ht.name());