Start5 chars → up to 8 in German
GermanStart···8
FrenchStart···8
SpanishStart··7
JapaneseStart5
German runs about a quarter longer than English, and a one-word button can grow by half again because it has no long words to average against. Paste your labels, pick your target languages, and see the space each will need before the translation arrives and the layout has to be rebuilt.
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The previews are padded rather than translated, because the question is how much room the text needs and not what it says. Short strings grow proportionally more than long ones: a one-word button has no long words to average against, which is why labels break and paragraphs usually do not.
Takes your labels and shows how much room each will need in the languages you are translating into, with a padded preview so you can see the length rather than read a percentage.
Expansion depends on how long the string already is. A paragraph rarely grows more than a fifth, because its long words and short words average out. A one-word button has nothing to average against, so a single German compound noun can take it half as long again. Sizing a button from a paragraph expansion rate is exactly how a button ends up two lines deep in German, and it is the commonest layout mistake in a localized course.
The question is how much space the text needs, not what it says. Shown real German, a reader starts judging the words instead of the room they occupy, which is the wrong thing to be looking at and the wrong stage to be looking at it.
These are industry ranges, not measurements of your content. A given sentence can beat or miss them badly. They are the right basis for a layout decision and the wrong basis for a schedule. And for a right-to-left language, length is the smaller problem: the layout mirrors, which affects every element positioned from an edge and every icon that points somewhere.