You can export and import translation patterns.
First Export your current tr-rules
Use Bulk administration > Import/Export > Export, check the Call Routing Data/Translation Pattern check box and run the job.
You will get a tar file that you download, open the tar file with 7-zip or similar.
In the file you will find a header.txt file and translationpattern.csv, extract the translationpattern.csv and edit the tr-rules you want to modify, add new tr rules and remove the rules you don't want to change.
Add the translationpattern.csv to your tar file, upload it to the publisher and use Bulk administration > Import/Export > Import to add/update your rules.
Don't think there is any way to bulk delete translation patterns
