Spreadsheet has many options. But I wondered why two of the "add" features translated the same, even though they are different. "insert before" and "after".
The reason lies in a logic error in the template (/templates/tiki-view_sheets_menu.tpl), most likely a copy&paste error.
<li><a onclick="sheetInstance.controlFactory.addRow(null, true); return false;" title="{tr}Inserts an additional row after currently selected row.{/tr}">{tr}Insert Row Before{/tr}</a></li> <li><a onclick="sheetInstance.controlFactory.addRow(); return false;" title="{tr}Inserts an additional row after currently selected row.{/tr}">{tr}Insert Row After{/tr}</a></li>
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To help developers solve the bug, we kindly request that you demonstrate your bug on a show.tikiwiki.org instance. To start, simply select a version and click on "Create show.tikiwiki.org instance". Once the instance is ready (in a minute or two), as indicated in the status window below, you can then access that instance, login (the initial admin username/password is "admin") and configure the Tiki to demonstrate your bug. Priority will be given to bugs that have been demonstrated on show.tikiwiki.org.