According to article II.30.4 of the standard model grant agreement, participants must include in all dissemination actions the following statement acknowledging the financial support of the European Union:
The research leading to these results has received funding from the European Union's Seventh Framework Programme (FP7/2007-2013) under grant agreement n° xxxxxx.
In case the dissemination is provided in another language, participants should use the correspondent translated version of the sentence. In annex V of the Guide to Intellectual Property Rules in FP7 projects, you can find the translations of the statement in European Union languages other than English.
Moreover, in case of publicity material participants must in addition display the European emblem and specify that the content “reflects only the author’s views and that the Union is not liable for any use that may be made of the information contained therein” (see article II.12.1 of the standard model grant agreement).