Interface string: the cheapest language work there is
An interface string is a single piece of text in a product: a button label, an error message, a menu item. Translating a set of them is content work rather than model work, which is why it is the first language investment almost every company makes. As of 2026-09-22.
| Layer | What it takes to add a language | Who does the work |
|---|---|---|
| Interface strings | Translation and a switcher | Content and engineering |
| Generated documents | An instruction to the model | Engineering |
| Spoken dialogue | A voice, licensed and recorded | Engineering and licensing |
Inclusion rule. The three layers this register keeps, compared on what adding one language to each requires. Costs rise down the table. Order. Cheapest layer first.
1Cheap, visible, and therefore over-read
A translated interface is the language feature a visitor sees first and the one a company can add without touching a model. Those two facts together are why a language switcher gets mistaken for a statement about output.
Seeing your language in a menu tells you the marketing and product text was translated. It does not tell you the product will write or speak the language, and among the vendors read here it frequently does not.
2It is still informative about the company
Translating strings costs money per market and is maintained forever afterwards, so a company does it where it expects revenue. That makes the set a fairly candid map of where a vendor is selling.
This register counts declared site alternates for that reason rather than because the interface matters most. It is the layer with evidence attached; the other two are mostly undocumented.
3The gap between layers is the register subject
Among the vendors read here, the set with the longest interface declarations and the set with the longest voice lists barely overlap. Several vendors with no declared interface language publish the most detailed voice documentation.
So the cheapest layer and the most expensive one are filled by almost different companies. Any single language score would have to weight the two, and there is no defensible weighting.
A definition, not a measurement: no vendor figure appears here that is not also in the register. The three layers are described one at a time on the columns pages.
Nearby terms: Transcreation, Working document. The whole vocabulary is at terms; nothing on this page is a claim about a named product.