Add in terms from other source

// This is the default LanguageSource (but you can select any other you want)
LanguageSource I2languages = I2.Loc.LocalizationManager.Sources [0];

// Create the term (if it doesn't already exist) and returns the struct that has all its translations
TermData data = I2Languages.AddTerm( "Term Hello", eTermType.Text, false );

// Fill the translations
data.Languages[ I2Languages.GetLanguageIndex("English") ] = "English Translation";
data.Languages[ I2Languages.GetLanguageIndex("Spanish") ] = "Traduccion al espannol";

// Update the Dictionary (only needed In-Game)
I2Languages.UpdateDictionary(true);

// Mark the source as dirty so that unity save it when you close the project
EditorUtility.SetDirty(I2Languages);

// You can also do this to force saving it (although you should call this last line only after you added all the terms you need)
AssetDatabase.SaveAssets();

			// This is the default LanguageSource (but you can select any other you want)
            LanguageSourceData I2Languages = I2.Loc.LocalizationManager.Sources[0];

			// Create the term (if it doesn't already exist) and returns the struct that has all its translations
            TermData data = I2Languages.AddTerm( "Term Hello", eTermType.Text, false );

			// Fill the translations
            data.Languages[ I2Languages.GetLanguageIndex("English") ] = "English Translation";
            data.Languages[ I2Languages.GetLanguageIndex("Spanish") ] = "Traduccion al espannol";

			// Update the Dictionary (only needed In-Game)
            I2Languages.UpdateDictionary(true);

			// Mark the source as dirty so that unity save it when you close the project
            I2Languages.Editor_SetDirty();

			// You can also do this to force saving it (although you should call this last line only after you added all the terms you need)
            AssetDatabase.SaveAssets();