Fix compatibility with 2026.1

[CyrilleB79]

Issue

When trying to override compatibility with NVDA 2026.1beta1, an error occurs at startup and the add-on cannot load.
This is due to the fact thatversion_year has been moved in 2026.1.

Once this first issue fixed, the following deprecation warning occurs:
DEBUGWARNING - Python warning (22:07:38.937) - MainThread (8924):
C:\Users\cyril\AppData\Roaming\nvda\addons\instantTranslate\globalPlugins\instantTranslate_init_.py:53: ```
DeprecationWarning: 'locale.getdefaultlocale' is deprecated and slated for removal in Python 3.15. Use setlocale(), getencoding() and getlocale() instead.
lo_lang = getdefaultlocale()

### Solution
* Rather than checking NVDA version, directly try to import `speech.speech` and else only import `speech`.
* Regarding the deprecation: use `getlocale()` as recommended.
### Tests
Tested translation, automatic translation and translation of last spoken text.