Salesforce1 Language attributes
|Knowledge Article Number||000187660|
|Description||Users may notice inconsistent language support within Salesforce1 if using the Native downloadable client.|
|Resolution||The Salesforce1 client pulls language support attributes from both the local device settings per the locale and browser language setting and the salesforce server information per per the user's profile.
A user may notice inconsistent language support because the Salesforce1 app is pulling language preferences from two places. For example, the hard coded aspects of the client such as the Stage Left menu or the main Feed page, will follow the preferred language based on the device's settings while the Record Detail pages or Record Feed pages are sever-based and will pull that language preference from the salesforce organization.
Apps such as Feed and Today will not change language despite your devices's settings or Salesforce preferences. These are branded Salesforce terms.