I translated English texts (in Languages folder) into Polish (Not all of Construct is translatable yet).
How to install it:
*Unpack archive Polish.zip
*Replace all texts files from folder Polish into folder English (UK), which is in folder Languages (eg. C:\Program Files\Scirra\Construct\Languages)
This is little bug for translators:
Edytuj zmienne (on image is Edytuj emiemienne) - "Edit Variables"
(This goes to bug tracker)