In English, “preposition” is a fairly broad category.  It includes not only what are classified as “locatives” in Latin/Romance languages, but also what German calls “adverbs of time” (before, after, during, etc.) and “adverbs of place” (aboard, abroad, adrift, etc.), the latter being classed as “adjectival prepositions” in English, that is, they can be labeled as either adjectives or as prepositions.