Use perl instead of sed to fix build error in macos.

[theSinner]

Hi

In my previous PR for adding change language option, @floreks added some lines to aio/scripts/build.sh to prevent caching after changing language using sed command which makes build failed in macOS, because in macOS sed command is a little bit different from Linux.
I changed sed with perl which does the same thing and the dashboard builds successfully in macOS and I think it works in Linux, too.

[codecov]

Codecov Report

Merging #5700 (95e095d) into master (5cb109f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5700   +/-   ##
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  Coverage   44.36%   44.36%           
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  Files         214      214           
  Lines        9124     9124           
  Branches      113      113           
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  Hits         4048     4048           
  Misses       4801     4801           
  Partials      275      275           

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[maciaszczykm]

It's true, that macOS has different version of sed built-in and it doesn't work with current build script. Normally, I'd recommend to install GNU version of sed but if pearl will work on Linux too I think we can merge it to make it more convenient for all of us.

@floreks can you verify if it works on Linux? After change there are no more issues on macOS, so I'd be glad to merge it.

[floreks]

I will verify and merge if it works.

[floreks]

Seems to be working just fine on Ubuntu.

/lgtm
/approve

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