i18n: Add japanese + i18n service

Modals/Clipboard/ClipboardContent.qml

@@ -30,7 +30,7 @@ Item {
             showKeyboardHints: modal.showKeyboardHints
             onKeyboardHintsToggled: modal.showKeyboardHints = !modal.showKeyboardHints
             onClearAllClicked: {
-                clearConfirmDialog.show("Clear All History?", "This will permanently delete all clipboard history.", function () {
+                clearConfirmDialog.show(I18n.tr("Clear All History?"), I18n.tr("This will permanently delete all clipboard history."), function () {
                     modal.clearAll()
                     modal.hide()
                 }, function () {})
@@ -116,7 +116,7 @@ Item {
                 }
                 
                 StyledText {
-                    text: qsTr("No clipboard entries found")
+                    text: I18n.tr("No clipboard entries found")
                     anchors.centerIn: parent
                     font.pixelSize: Theme.fontSizeMedium
                     color: Theme.surfaceVariantText

Modals/Clipboard/ClipboardEntry.qml

@@ -80,11 +80,11 @@ Rectangle {
                     text: {
                         switch (entryType) {
                         case "image":
-                            return "Image • " + entryPreview
+                            return I18n.tr("Image") + " • " + entryPreview
                         case "long_text":
-                            return "Long Text"
+                            return I18n.tr("Long Text")
                         default:
-                            return "Text"
+                            return I18n.tr("Text")
                         }
                     }
                     font.pixelSize: Theme.fontSizeSmall

Modals/Clipboard/ClipboardHeader.qml

@@ -28,7 +28,7 @@ Item {
         }
 
         StyledText {
-            text: `Clipboard History (${totalCount})`
+            text: I18n.tr("Clipboard History") + ` (${totalCount})`
             font.pixelSize: Theme.fontSizeLarge
             color: Theme.surfaceText
             font.weight: Font.Medium

Modals/Clipboard/ClipboardHistoryModal.qml

@@ -91,7 +91,7 @@ DankModal {
     function copyEntry(entry) {
         const entryId = entry.split('\t')[0]
         Quickshell.execDetached(["sh", "-c", `cliphist decode ${entryId} | wl-copy`])
-        ToastService.showInfo("Copied to clipboard")
+        ToastService.showInfo(I18n.tr("Copied to clipboard"))
         hide()
     }
 
@@ -153,7 +153,7 @@ DankModal {
 
     ConfirmModal {
         id: clearConfirmDialog
-        confirmButtonText: "Clear All"
+        confirmButtonText: I18n.tr("Clear All")
         confirmButtonColor: Theme.primary
         onVisibleChanged: {
             if (visible) {

Modals/Clipboard/ClipboardKeyboardHints.qml

@@ -26,7 +26,7 @@ Rectangle {
         }
 
         StyledText {
-            text: qsTr("Shift+Del: Clear All • Esc: Close")
+            text: I18n.tr("Shift+Del: Clear All • Esc: Close")
             font.pixelSize: Theme.fontSizeSmall
             color: Theme.surfaceText
             anchors.horizontalCenter: parent.horizontalCenter