Fix: Chinese Translation Sync Check always fails

[christian-byrne]

Don't exit with status code > 0 if grep/diff fails and fix issue described below:

Looking at the debug logs, I can see the issue. The
problem is in the way shell arrays are being used in
GitHub Actions. The main issue is:

1. Array initialization syntax: Lines like
   MOVED_FILES=() and MISSING_TRANSLATIONS=() work in bash,
   but there are additional issues with how the arrays are
   being handled in the GitHub Actions environment.
2. The specific error: Looking at the debug logs, I can
   see that the script is failing because when GitHub
   Actions processes the workflow, it's having trouble with
   the double curly braces ${{}} syntax when it's mixed
   with shell array operations.

The issue is that GitHub Actions is trying to evaluate
${{#MISSING_TRANSLATIONS[@]}} as GitHub Actions syntax
rather than shell syntax. Let me fix this: