piral-translate: Do not replace falsy variables with an empty string

[manuelroemer]

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Description

Updates piral-translate so that falsy variables are not replaced with an empty string. This is currently causing issues in an application where we have text like "Number of items: {{number}}.". If the variable number is 0, the final translated text is Number of items: . instead of the expected Number of items: 0..

Remarks

I don't think that this should be breaking in a bad way for anyone, but am happy to be told otherwise..

[github-actions]

File size impact

Merging fix/piral-translate-do-not-replace-falsy-vars-with-empty-string into develop impact files as follow:

empty-piral (no impact)

Files	new size
Unmodified (2)	30 kB (0 B / +0%)	👻
Total (2)	30 kB (0 B / +0%)	👻

minimal-piral (no impact)

Files	new size
Unmodified (2)	278 kB (0 B / +0%)	👻
Total (2)	278 kB (0 B / +0%)	👻

sample-cross-fx (no impact)

Files	new size
Unmodified (3)	2.23 MB (0 B / +0%)	👻
Total (3)	2.23 MB (0 B / +0%)	👻

sample-piral (+0%)

Files	new size
src/samples/sample-piral/dist/release/index.707f14.js	527 kB	👶
src/samples/sample-piral/dist/release/main.f11ab8.css	170 kB	👶
src/samples/sample-piral/dist/release/main.27f8ea.css	deleted (-170 kB)
src/samples/sample-piral/dist/release/index.1c4ce2.js	deleted (-527 kB)
src/samples/sample-piral/dist/release/index.html	490 B (0 B / +0%)	👻
Total (5)	697 kB (+30 B / +0%)	↗️

sample-piral-core (no impact)

Files	new size
Unmodified (3)	355 kB (0 B / +0%)	👻
Total (3)	355 kB (0 B / +0%)	👻

_{Generated by @jsenv/file-size-impact during check-bundle-size#7142912021 on 00539e7}

[FlorianRappl]

LGTM - thanks for the fix!