fix: English onboarding localization issue

[Maclean-D]

Before	After

[gemini-code-assist]

Code Review

This pull request correctly fixes a localization issue on the English onboarding screen where a newline was being rendered as the literal text \n. This was caused by an extra backslash in the resource file, which escaped the newline sequence (\\n). The change removes the extra backslash, so \n is now correctly interpreted as a newline character. This resolves the visual bug shown in the pull request description. The changes are applied consistently across the .arb resource file and the auto-generated Dart localization files. The fix is correct and no issues were found.