Impress - spell language

I was using Impress, and I can’t find where I choose the current dictionary for spelling.
On Writer is on page bottom.

Where is this option?

I want to make all file in another language (like Writer), for a single word I can change the dictionary.

For the entire document:

Menu Tools → Options → Language Settings → Languages

Default languages for documents / Western

Select the required language in the drop-down list

:ballot_box_with_check: For the current document only (enabled)

For the current document only (disabled, if required for all documents)

Press OK

For selected text:

Menu Format → Character → Fonts

Western text font → Language

Select the required language in the drop-down list

Press OK

Doesn’t work the first option too.

See also: LibreOffice Draw (4.0.4.2 or older) can not set spellcheck/language

See also this check list (with regard to your required language).