Here's a fairly straightforward solution framework that may be suitable for your application.

Create a text/language file with this format:

. . .
strCliDeactivated => 'Currently not active',
strNotActive      => 'date has not yet been reached',
strExpired        => 'date has been reached',
. . .
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Then in your main code, slurp in the whole file and create a hash which can then be used when required.

. . .
my @global_data = <TEXT_LANG>;
my %globals;
eval "\%globals = ( @global_data )";
. . .
print STDERR $globals{strExpired} if $expired;
. . .
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Update: Sorry, I had two solutions in my head - I posted half of each. I've added two lines to the main code replacing:

Apologies for any confusion.