Add JavaScript to .clang-format (#3708)

diff --git a/.clang-format b/.clang-format
index e4165ce..208a93c 100644
--- a/.clang-format
+++ b/.clang-format
@@ -230,4 +230,7 @@
   - QT_REQUIRE_VERSION
 TabWidth:        8
 UseTab:          Never
+---
+Language: JavaScript
+ColumnLimit:     132
 ...