Gamers should rejoice, as planet earths ‘common tongue’ is called ELFE
English as a lingua franca for Europe, also known by the abbreviation ELFE, is a concept promoted by some linguistics experts, which aims to standardize the use of the English language in the European Union. English, in some form or another, is already widely used and understood by people in EU countries, despite it only being spoken natively by a small percentage of those people. However, regional differences in English, as well as peculiarities in spelling, vocabulary and grammar shared with few other European languages, have made learning it more difficult for many Europeans; ELFE does not only aim at making English easier to learn (this is the main objective of other projects like for example "Simple English"): ELFE indicates the development of high level languages for a global society.
Actually ELFE is used worldwide as it is the common second tongue, businessmen who don’t know each others languages know enough English to converse with each other.
As a side note, it’s interesting that the term lingua franca has arabic/french/italian roots.