Fix #1355488 [(Enhancement) Add a restart button to Configuration Warning](https://bugs.launchpad.net/calibre/+bug/1355488)
Add option to only build specified UM translations
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Do not translate generated docs in user manual

Instead use the translated text from the main calibre translations
directly.
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Use new manual build framework for building manual pot files
Parallelize compiling of main translation .po files
Prevent long saved searches from making the saved search dialog too wide