feat(locale): add Fluent translations

Default to the platform language with persisted overrides across native and web builds.

Refs #630

src/ui/window/options.rs

@@ -9,6 +9,7 @@ pub fn view_window<'a>(
     default_save_format: &'a str,
     ui_theme: &'a UiThemeConfig,
     theme_color_inputs: &'a [String; 6],
+    language: crate::i18n::Language,
     sizing: crate::ui::modal::ModalSizing,
 ) -> Element<'a, Message> {
     let selected_format = crate::io::SAVE_FORMAT_OPTIONS
@@ -25,12 +26,12 @@ pub fn view_window<'a>(
 
     let palette = ui_theme.palette.to_iced();
     let colors = [
-        ("Background", palette.background),
-        ("Text", palette.text),
-        ("Primary", palette.primary),
-        ("Success", palette.success),
-        ("Warning", palette.warning),
-        ("Danger", palette.danger),
+        (crate::tr!("options-color-background"), palette.background),
+        (crate::tr!("options-color-text"), palette.text),
+        (crate::tr!("options-color-primary"), palette.primary),
+        (crate::tr!("options-color-success"), palette.success),
+        (crate::tr!("options-color-warning"), palette.warning),
+        (crate::tr!("options-color-danger"), palette.danger),
     ];
 
     let mut color_controls = column![].spacing(8);
@@ -60,16 +61,31 @@ pub fn view_window<'a>(
         );
     }
 
-    let close = button(text("Close").size(12))
+    let close = button(text(crate::tr!("action-close")).size(12))
         .on_press(Message::CloseModal)
         .padding([6, 18])
         .style(button::secondary);
 
     let content = column![
-        text("Open and Save").size(15),
+        text(crate::tr!("options-language-section")).size(15),
         Space::new().height(10),
         row![
-            text("Default save format:").size(12).width(150),
+            text(crate::tr!("options-language-label")).size(12).width(150),
+            iced::widget::pick_list(
+                Some(language),
+                crate::i18n::Language::ALL,
+                |value| value.to_string(),
+            )
+            .on_select(Message::LanguageChanged)
+            .width(sizing.width),
+        ]
+        .spacing(12)
+        .align_y(iced::Center),
+        Space::new().height(22),
+        text(crate::tr!("options-open-save-section")).size(15),
+        Space::new().height(10),
+        row![
+            text(crate::tr!("options-default-save-format-label")).size(12).width(150),
             iced::widget::pick_list(
                 selected_format,
                 crate::io::SAVE_FORMAT_OPTIONS,
@@ -81,16 +97,14 @@ pub fn view_window<'a>(
         .spacing(12)
         .align_y(iced::Center),
         Space::new().height(8),
-        text(
-            "Used for the first save of a new drawing. Existing drawings keep their file type and version."
-        )
+        text(crate::tr!("options-default-save-format-help"))
         .size(11)
         .width(sizing.width),
         Space::new().height(22),
-        text("Theme").size(15),
+        text(crate::tr!("options-theme-section")).size(15),
         Space::new().height(10),
         row![
-            text("Iced theme:").size(12).width(150),
+            text(crate::tr!("options-theme-label")).size(12).width(150),
             iced::widget::pick_list(
                 selected_theme,
                 theme_options,
@@ -102,9 +116,7 @@ pub fn view_window<'a>(
         .spacing(12)
         .align_y(iced::Center),
         Space::new().height(8),
-        text(
-            "Changing a base colour switches to Custom. Iced generates every component shade from these six colours."
-        )
+        text(crate::tr!("options-theme-help"))
         .size(11)
         .width(sizing.width),
         Space::new().height(12),