Hi fzameen,
According to your description, there are 2 questions you wonder to solve. Question 1, you wonder to know which language pack are installed in your Office. Question 2, you wonder to how the language for spelling check in Office work. Is my understanding correct?
Microsoft Office uses the default input language in the Windows operating system to determine the default language for Office programs. To change the default language in Office programs, you must change the default input language for the Windows operating
system, and then change the default editing language for Office.
So you need to check the default input language in Windows first.
In Windows 8:
- In the Charms bar, search Apps for Control Panel.
- Click Change input methods under Clock, Language, and Region.
- Click Add language to add a new language.
- Or click Options for a language you already have installed, and then click Add an input method.
In Windows 7:
- Click Start, and then click Control Panel.
- Under Clock, Language, and Region, under Region and Language, click Change keyboards or other input methods.
- In the Region and Language dialog box, on the Keyboards and Languages tab, click Change keyboards.
- In the Text Services and Input Languages dialog box, under Default input language, click the language that you want to use as the default language, and then go to set the default editing language in Office.
- If the language that you want to use as the default input language is not listed, complete Steps 5 through 8.
- Under Installed services, click Add.
- Expand the language that you want to use as the default input language, and then expand Keyboard.
- Select the check box for the keyboard or Input Method Editor (IME) that you want to use, and then click OK. The language is added to the Default input language list.
- To preview the keyboard layout, click Preview.
- Under Default input language, click the language that you want to use as the default language.
Now for question 1, to check the language pack in your Office. Please try these steps
- Open an Office application, like Word.
- Click File > Options > Language.
- In the Set the Office Language Preferences dialog box, in the Proofing (Spelling, Grammar) list, if you see the Spelling & Grammar icon next to the language you want, then that language pack is installed.
Please refer to the following link:
https://support.office.com/en-US/article/Enable-the-use-of-other-languages-in-your-Office-programs-663D9D94-CA99-4A0D-973E-7C4A6B8A827D
For question 2, please refer to the following link about how spell check and grammar check work.
https://support.office.com/en-ZA/article/choose-how-spell-check-and-grammar-check-work-71fd027a-be9c-42b0-8055-75f46324a16a
Please refer to these article and check if they are useful. Im glad to help and follow up your reply.
Hope its helpful.
Regards,
George Zhao
TechNet Community Support