I see little difference in maintainablility between:

(
    "The quick",
    "brown fox",
    "jumps over",
    "the lazy",
    "dog",
);
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And:

"The quick", "brown fox", "jumps over", "the lazy", "dog"
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But if you do, you could do the same thing -- put each language into a separate csv file -- and do:

my @text = someCSVparser( "$lang.csv" );
...
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It'll be slower, but for 1500 strings, probably not enough to worry about.

If performance is a concern -- as it seemed from your OP -- then you could store the texts in .csv files and use an off-line process to create the Storable form from them whenever they change. It has the advantage of ensuring that if the storable format shoudl ever change in incompatible ways -- it has happened in the past -- then you have the sources to fall back on.