general: Change user-facing name to Image Viewer

This is part of the move to Core.

Part-of: <https://gitlab.gnome.org/GNOME/loupe/-/merge_requests/256>

src/about.rs

@@ -24,7 +24,7 @@ pub async fn window() -> adw::AboutWindow {
     // an object and set all relevant properties very
     // easily in a way that's idiomatic to Rust.
     adw::AboutWindow::builder()
-        .application_name(gettext("Loupe"))
+        .application_name(gettext("Image Viewer"))
         .application_icon(config::APP_ID)
         .version(config::VERSION)
         .developer_name(gettext("The Loupe Team"))

src/window.rs

@@ -862,13 +862,13 @@ impl LpWindow {
     fn window_title(&self, file: Option<&gio::File>) -> String {
         // ensure that templates are initialized
         if file.is_none() {
-            gettext("Loupe")
+            gettext("Image Viewer")
         } else {
             self.imp()
                 .image_view
                 .current_file()
                 .and_then(|f| util::get_file_display_name(&f)) // If the file exists, get display name
-                .unwrap_or_else(|| gettext("Loupe")) // Return that or the default if there's nothing
+                .unwrap_or_else(|| gettext("Image Viewer")) // Return that or the default if there's nothing
         }
     }