fix: handle exceptions without a message attribute on compile translations e.g. FileNotFoundError

[ArturGaspar]

Description

Avoids causing another exception in the exception handling of compile_translations() in installation.

Testing instructions

1. Install in an environment where compiling translations will fail with FileNotFoundError (e.g. if msgfmt is not installed)
2. See that installation succeeds

Other information

Private-ref: https://tasks.opencraft.com/browse/BB-8077

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[mphilbrick211]

Hi @ArturGaspar! Is this ready for review?

[ArturGaspar]

@mphilbrick211 Yes.

[mphilbrick211]

Hi @openedx/2u-arbi-bom! Would some be able to please review / merge this for us? Thanks!

[mphilbrick211]

Hi @awais786! Are you still able to review / merge this?

[iamsobanjaved]

@ArturGaspar Kindly rebase the PR.

[ArturGaspar]

@iamsobanjaved Done.

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