fix indentation

Change-Id: I36be2de793d3d32433530bf71632cb73a676bb9a
prevent invalid OOXML files with trendlines, related #i88825#

Change-Id: I503b24233060400cf4bbb40701bec0a3e101512a
the string is UTF8 and not Ascii

Change-Id: Ibf9a837ca5689ceae91eff2a081da3b7fe0b9244