[i18n-ignore] update .github/PULL_REQUEST_TEMPLATE.md (#2446)

Author: GuoJikun

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,7 +2,7 @@
 
 #### Description
 <!-- Translators, try to follow this pattern when naming your PRs:
-"i18(language code): (short description)" -->
+"i18n(language code): (short description)" -->
 - What does this PR change? Give us a brief description. <!-- If it's an update try adding the commits as reference -->
 - Closes # <!-- Add an issue number if this PR will close it or remove it. -->