If taxonomy vocabulary changes from Translate to Localize how to combine terms? My d7 is using i18n, internationalization taxonomy. I have vocabulary that have option Translate. So it looks like (eng, de):
Creative
- Projects
- Portfolio
Kreativ (de)
- Projekte (de)
- Portfolio (de)

These terms have relations between one and other. Really I have about 150 terms and  want to simplify this vocabulary. Need to change it to Localize option. If I will check Localize all terms beacame independent (single) so this is very very bad.
How to combine all of them, please?
Looks like you should consider using the Taxonomy Manager module. From its project page:

... provides a powerful interface for managing taxonomies. A vocabulary gets displayed in a dynamic tree view, where parent terms can be expanded to list their nested child terms or can be collapsed.
The Taxonomy Manager has following operations and key features:

...
merging of terms (using the Term merge module in 7.x)
...