fix: make import/export button casing consistent in English translation

- Changed 'Import mode' to 'Import Mode' to match 'Export Mode'
- Both buttons now use consistent title case

Author: daniel-lxs

webview-ui/src/i18n/locales/en/prompts.json

@@ -4,7 +4,7 @@
 	"modes": {
 		"title": "Modes",
 		"createNewMode": "Create new mode",
-		"importMode": "Import mode",
+		"importMode": "Import Mode",
 		"editModesConfig": "Edit modes configuration",
 		"editGlobalModes": "Edit Global Modes",
 		"editProjectModes": "Edit Project Modes (.roomodes)",