Update and rename 2.5.10.md to 2.5.31.md

Author: yaira2

2.5.10.md

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+**Changes in v2.5.31**
+
+- Added support for copying multiple item paths together
+- Added speed graph to the status center
+- Fixed an issue with admin operations not working
+- Fixed an issue where new files were sometimes created in the wrong directory
+- Fixed crash when dragging files from Gmail