message: Fix escape braces in bibtex format
diff: "name": "constant.numeric.bibtex"
  },
  "nested_braces": {
  - "begin": "\\{",
  + "begin": "(?<!\\\\)\\{",
  "beginCaptures": {
  "0": {
  "name": "punctuation.definition.group.begin.bibtex"
  }
  },
  - "end": "\\}",
  + "end": "(?<!\\\\)\\}",
  "endCaptures": {
  "0": {
  "name": "punctuation.definition.group.end.bibtex"
  