Greasy Fork is available in English.
This is a userscript which highlights subsequent posts by the thread-starter in the SpaceBattles and Sufficient Velocity forums. It also displays a short information at the top of each page if a post by the thread-starter can be found on the current page.
Changelog
v1.0.5 (Nov 5, 2014) - added HTTPS support for SV (thanks NuitTombee)
v1.0.4 (Jul 4, 2014) - Fixed bug, where wrong posts could be highlighted due to error in partial user name matching
v1.0.3 (Jun 17, 2014) - Added support for SV FlexileSpace style
v1.0.2 (Jun 13, 2014) - Fixed bug, where posts by staff on SB would not be highlighted
v1.0.1 (Jun 11, 2014) - Added option to choose highlight color by active forum style
v1.0 (Jun 11, 2014) - Initial public version
