feat(ui): add language setting (#803)

* feat(ui): add language setting

* translations: implement remaining todos

* ui: show language names in settings instead of codes

* translations: add Dutch setting, anticipating #798

tagstudio/resources/translations/en.json

@@ -199,6 +199,7 @@
     "menu.macros.folders_to_tags": "Folders to Tags",
     "menu.macros": "&Macros",
     "menu.select": "Select",
+    "menu.settings": "Settings...",
     "menu.tools.fix_duplicate_files": "Fix Duplicate &Files",
     "menu.tools.fix_unlinked_entries": "Fix &Unlinked Entries",
     "menu.tools": "&Tools",
@@ -209,16 +210,20 @@
     "namespace.create.title": "Create Namespace",
     "namespace.new.button": "New Namespace",
     "namespace.new.prompt": "Create a New Namespace to Start Adding Custom Colors!",
+    "preview.multiple_selection": "<b>{count}</b> Items Selected",
     "preview.no_selection": "No Items Selected",
     "select.add_tag_to_selected": "Add Tag to Selected",
     "select.all": "Select All",
     "select.clear": "Clear Selection",
     "edit.copy_fields": "Copy Fields",
     "edit.paste_fields": "Paste Fields",
     "settings.clear_thumb_cache.title": "Clear Thumbnail Cache",
+    "settings.language": "Language",
     "settings.open_library_on_start": "Open Library on Start",
+    "settings.restart_required": "Please restart TagStudio for changes to take effect.",
     "settings.show_filenames_in_grid": "Show Filenames in Grid",
     "settings.show_recent_libraries": "Show Recent Libraries",
+    "settings.title": "Settings",
     "sorting.direction.ascending": "Ascending",
     "sorting.direction.descending": "Descending",
     "splash.opening_library": "Opening Library \"{library_path}\"...",

tagstudio/src/core/enums.py

@@ -17,6 +17,7 @@ class SettingItems(str, enum.Enum):
     SHOW_FILENAMES = "show_filenames"
     AUTOPLAY = "autoplay_videos"
     THUMB_CACHE_SIZE_LIMIT = "thumb_cache_size_limit"
+    LANGUAGE = "language"
 
 
 class Theme(str, enum.Enum):

tagstudio/src/qt/modals/settings_panel.py

@@ -0,0 +1,73 @@
+# Copyright (C) 2025 Travis Abendshien (CyanVoxel).
+# Licensed under the GPL-3.0 License.
+# Created for TagStudio: https://github.com/CyanVoxel/TagStudio
+
+
+from PySide6.QtCore import Qt
+from PySide6.QtWidgets import QComboBox, QFormLayout, QLabel, QVBoxLayout, QWidget
+from src.core.enums import SettingItems
+from src.qt.translations import Translations
+from src.qt.widgets.panel import PanelWidget
+
+
+class SettingsPanel(PanelWidget):
+    def __init__(self, driver):
+        super().__init__()
+        self.driver = driver
+        self.setMinimumSize(320, 200)
+        self.root_layout = QVBoxLayout(self)
+        self.root_layout.setContentsMargins(6, 0, 6, 0)
+
+        self.form_container = QWidget()
+        self.form_layout = QFormLayout(self.form_container)
+        self.form_layout.setContentsMargins(0, 0, 0, 0)
+
+        self.restart_label = QLabel()
+        self.restart_label.setHidden(True)
+        Translations.translate_qobject(self.restart_label, "settings.restart_required")
+        self.restart_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
+
+        language_label = QLabel()
+        Translations.translate_qobject(language_label, "settings.language")
+        self.languages = {
+            # "Cantonese (Traditional)": "yue_Hant",  # Empty
+            "Chinese (Traditional)": "zh_Hant",
+            # "Czech": "cs",  # Minimal
+            # "Danish": "da",  # Minimal
+            "Dutch": "nl",
+            "English": "en",
+            "Filipino": "fil",
+            "French": "fr",
+            "German": "de",
+            "Hungarian": "hu",
+            # "Italian": "it",  # Minimal
+            "Norwegian Bokmål": "nb_NO",
+            "Polish": "pl",
+            "Portuguese (Brazil)": "pt_BR",
+            # "Portuguese (Portugal)": "pt",  # Empty
+            "Russian": "ru",
+            "Spanish": "es",
+            "Swedish": "sv",
+            "Tamil": "ta",
+            "Toki Pona": "tok",
+            "Turkish": "tr",
+        }
+        self.language_combobox = QComboBox()
+        self.language_combobox.addItems(list(self.languages.keys()))
+        current_lang: str = str(
+            driver.settings.value(SettingItems.LANGUAGE, defaultValue="en", type=str)
+        )
+        current_lang = "en" if current_lang not in self.languages.values() else current_lang
+        self.language_combobox.setCurrentIndex(list(self.languages.values()).index(current_lang))
+        self.language_combobox.currentIndexChanged.connect(
+            lambda: self.restart_label.setHidden(False)
+        )
+        self.form_layout.addRow(language_label, self.language_combobox)
+
+        self.root_layout.addWidget(self.form_container)
+        self.root_layout.addStretch(1)
+        self.root_layout.addWidget(self.restart_label)
+
+    def get_language(self) -> str:
+        values: list[str] = list(self.languages.values())
+        return values[self.language_combobox.currentIndex()]

tagstudio/src/qt/translations.py

@@ -70,26 +70,28 @@ def translate_with_setter(self, setter: Callable[[str], None], key: str, **kwarg
 
         Also formats the translation with the given keyword arguments.
         """
-        if key in self._strings:
-            self._strings[key].changed.connect(lambda text: setter(self.__format(text, **kwargs)))
+        # TODO: Fix so deleted Qt objects aren't referenced any longer
+        # if key in self._strings:
+        #     self._strings[key].changed.connect(lambda text: setter(self.__format(text, **kwargs)))
         setter(self.translate_formatted(key, **kwargs))
 
     def __format(self, text: str, **kwargs) -> str:
         try:
             return text.format(**kwargs)
-        except KeyError:
-            logger.warning(
-                "Error while formatting translation.", text=text, kwargs=kwargs, language=self._lang
+        except (KeyError, ValueError):
+            logger.error(
+                "[Translations] Error while formatting translation.",
+                text=text,
+                kwargs=kwargs,
+                language=self._lang,
             )
             return text
 
     def translate_formatted(self, key: str, **kwargs) -> str:
         return self.__format(self[key], **kwargs)
 
     def __getitem__(self, key: str) -> str:
-        # return "???"
-        return self._strings[key].value if key in self._strings else "Not Translated"
+        return self._strings[key].value if key in self._strings else f"[{key}]"
 
 
 Translations = Translator()
-# Translations.change_language("de")

tagstudio/src/qt/ts_qt.py

@@ -87,6 +87,7 @@
 from src.qt.modals.fix_dupes import FixDupeFilesModal
 from src.qt.modals.fix_unlinked import FixUnlinkedEntriesModal
 from src.qt.modals.folders_to_tags import FoldersToTagsModal
+from src.qt.modals.settings_panel import SettingsPanel
 from src.qt.modals.tag_color_manager import TagColorManager
 from src.qt.modals.tag_database import TagDatabasePanel
 from src.qt.modals.tag_search import TagSearchPanel
@@ -197,6 +198,10 @@ def __init__(self, backend, args):
             )
             self.config_path = self.settings.fileName()
 
+        Translations.change_language(
+            str(self.settings.value(SettingItems.LANGUAGE, defaultValue="en", type=str))
+        )
+
         # NOTE: This should be a per-library setting rather than an application setting.
         thumb_cache_size_limit: int = int(
             str(
@@ -366,19 +371,6 @@ def start(self) -> None:
         file_menu.addMenu(self.open_recent_library_menu)
         self.update_recent_lib_menu()
 
-        open_on_start_action = QAction(self)
-        Translations.translate_qobject(open_on_start_action, "settings.open_library_on_start")
-        open_on_start_action.setCheckable(True)
-        open_on_start_action.setChecked(
-            bool(self.settings.value(SettingItems.START_LOAD_LAST, defaultValue=True, type=bool))
-        )
-        open_on_start_action.triggered.connect(
-            lambda checked: self.settings.setValue(SettingItems.START_LOAD_LAST, checked)
-        )
-        file_menu.addAction(open_on_start_action)
-
-        file_menu.addSeparator()
-
         self.save_library_backup_action = QAction(menu_bar)
         Translations.translate_qobject(self.save_library_backup_action, "menu.file.save_backup")
         self.save_library_backup_action.triggered.connect(
@@ -397,6 +389,23 @@ def start(self) -> None:
         self.save_library_backup_action.setEnabled(False)
         file_menu.addAction(self.save_library_backup_action)
 
+        file_menu.addSeparator()
+        settings_action = QAction(self)
+        Translations.translate_qobject(settings_action, "menu.settings")
+        settings_action.triggered.connect(self.open_settings_modal)
+        file_menu.addAction(settings_action)
+
+        open_on_start_action = QAction(self)
+        Translations.translate_qobject(open_on_start_action, "settings.open_library_on_start")
+        open_on_start_action.setCheckable(True)
+        open_on_start_action.setChecked(
+            bool(self.settings.value(SettingItems.START_LOAD_LAST, defaultValue=True, type=bool))
+        )
+        open_on_start_action.triggered.connect(
+            lambda checked: self.settings.setValue(SettingItems.START_LOAD_LAST, checked)
+        )
+        file_menu.addAction(open_on_start_action)
+
         file_menu.addSeparator()
 
         self.refresh_dir_action = QAction(menu_bar)
@@ -1830,6 +1839,24 @@ def clear_recent_libs(self):
         self.settings.sync()
         self.update_recent_lib_menu()
 
+    def open_settings_modal(self):
+        # TODO: Implement a proper settings panel, and don't re-create it each time it's opened.
+        settings_panel = SettingsPanel(self)
+        modal = PanelModal(
+            widget=settings_panel,
+            done_callback=lambda: self.update_language_settings(settings_panel.get_language()),
+            has_save=False,
+        )
+        Translations.translate_with_setter(modal.setTitle, "settings.title")
+        Translations.translate_with_setter(modal.setWindowTitle, "settings.title")
+        modal.show()
+
+    def update_language_settings(self, language: str):
+        Translations.change_language(language)
+
+        self.settings.setValue(SettingItems.LANGUAGE, language)
+        self.settings.sync()
+
     def open_library(self, path: Path) -> None:
         """Open a TagStudio library."""
         translation_params = {"key": "splash.opening_library", "library_path": str(path)}

tagstudio/src/qt/widgets/preview/file_attributes.py

@@ -23,6 +23,7 @@
 from src.core.library.alchemy.library import Library
 from src.core.media_types import MediaCategories
 from src.qt.helpers.file_opener import FileOpenerHelper, FileOpenerLabel
+from src.qt.translations import Translations
 
 if typing.TYPE_CHECKING:
     from src.qt.ts_qt import QtDriver
@@ -108,16 +109,22 @@ def update_date_label(self, filepath: Path | None = None) -> None:
                 created = dt.fromtimestamp(filepath.stat().st_ctime)
             modified: dt = dt.fromtimestamp(filepath.stat().st_mtime)
             self.date_created_label.setText(
-                f"<b>Date Created:</b> {dt.strftime(created, "%a, %x, %X")}"  # TODO: Translate
+                f"<b>{Translations["file.date_created"]}:</b> "
+                f"{dt.strftime(created, "%a, %x, %X")}"
             )
             self.date_modified_label.setText(
-                f"<b>Date Modified:</b> {dt.strftime(modified, "%a, %x, %X")}"  # TODO: Translate
+                f"<b>{Translations["file.date_modified"]}:</b> "
+                f"{dt.strftime(modified, "%a, %x, %X")}"
             )
             self.date_created_label.setHidden(False)
             self.date_modified_label.setHidden(False)
         elif filepath:
-            self.date_created_label.setText("<b>Date Created:</b> <i>N/A</i>")  # TODO: Translate
-            self.date_modified_label.setText("<b>Date Modified:</b> <i>N/A</i>")  # TODO: Translate
+            self.date_created_label.setText(
+                f"<b>{Translations["file.date_created"]}:</b> <i>N/A</i>"
+            )
+            self.date_modified_label.setText(
+                f"<b>{Translations["file.date_modified"]}:</b> <i>N/A</i>"
+            )
             self.date_created_label.setHidden(False)
             self.date_modified_label.setHidden(False)
         else:
@@ -132,7 +139,7 @@ def update_stats(self, filepath: Path | None = None, ext: str = ".", stats: dict
         if not filepath:
             self.layout().setSpacing(0)
             self.file_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
-            self.file_label.setText("<i>No Items Selected</i>")  # TODO: Translate
+            self.file_label.setText(f"<i>{Translations["preview.no_selection"]}</i>")
             self.file_label.set_file_path("")
             self.file_label.setCursor(Qt.CursorShape.ArrowCursor)
             self.dimensions_label.setText("")
@@ -221,7 +228,7 @@ def update_multi_selection(self, count: int):
         """Format attributes for multiple selected items."""
         self.layout().setSpacing(0)
         self.file_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
-        self.file_label.setText(f"<b>{count}</b> Items Selected")  # TODO: Translate
+        Translations.translate_qobject(self.file_label, "preview.multiple_selection", count=count)
         self.file_label.setCursor(Qt.CursorShape.ArrowCursor)
         self.file_label.set_file_path("")
         self.dimensions_label.setText("")

tagstudio/src/qt/widgets/preview_panel.py

@@ -105,14 +105,14 @@ def __init__(self, library: Library, driver: "QtDriver"):
         self.add_tag_button.setCursor(Qt.CursorShape.PointingHandCursor)
         self.add_tag_button.setMinimumHeight(28)
         self.add_tag_button.setStyleSheet(PreviewPanel.button_style)
-        self.add_tag_button.setText("Add Tag")  # TODO: Translate
+        Translations.translate_qobject(self.add_tag_button, "tag.add")
 
         self.add_field_button = QPushButton()
         self.add_field_button.setEnabled(False)
         self.add_field_button.setCursor(Qt.CursorShape.PointingHandCursor)
         self.add_field_button.setMinimumHeight(28)
         self.add_field_button.setStyleSheet(PreviewPanel.button_style)
-        self.add_field_button.setText("Add Field")  # TODO: Translate
+        Translations.translate_qobject(self.add_field_button, "library.field.add")
 
         add_buttons_layout.addWidget(self.add_tag_button)
         add_buttons_layout.addWidget(self.add_field_button)