Code blocks - language hint converted 2 code content

Using a code block

``````
```bash
# some bash script
```
``````

is converted to 

```
{code}bash
# some bash script
{code}
```

while it should become (according to [atlassian docs](https://confluence.atlassian.com/display/DOC/Confluence+Wiki+Markup+for+Macros#ConfluenceWikiMarkupforMacros-CodeBlockmacro))

```
{code:language=bash}
# some bash script
{code}
```
