Fixes the announcement of cell formatting commands in Excel

[CyrilleB79]

Link to issue number:

Fixes #15506
Fix-up of #14923

Summary of the issue:

When peforming tests for #14923, I have wrongly assumed that Excel cell formatting shortcuts were control+shift+2/3/4/5. This assumption was based on my tests with Excel's interface changed to English on my system. However, it seems that the keyboard layout when Excel is started has also an impact on the shortcuts containing digits (see discussion in #14923).
The actual shortcuts are control+2/3/4/5, as described in Microsoft documentation and as confirmed starting Excel with English GUI and English keyboard layout.

Description of user facing changes

On English systems (and probably many others), Excel cell formatting shortcuts control+2/3/4/5 will have their effect reported correctly. shift+control+2/3/4/5 will not report inappropriately formatting information on English systems.

Description of development approach

Modified the gesture definition.

Testing strategy:

Same as #14923 but taking care to have an English keyboard layout when starting Excel.

Known issues with pull request:

• Translators will have to modify their locale gestures.ini if the shortcuts differ in their language. That may be the case if the local keyboard layout uses shift to write digits.
• Translators will also have to check any mapping done after Report the state of cell formatting when using formatting shortcuts in Excel #14923 to see if it is still relevant or not.

Code Review Checklist:

• Documentation:
  • Change log entry
  • User Documentation
  • Developer / Technical Documentation
  • Context sensitive help for GUI changes
• Testing:
  • Unit tests
  • System (end to end) tests
  • Manual testing
• UX of all users considered:
  • Speech
  • Braille
  • Low Vision
  • Different web browsers
  • Localization in other languages / culture than English
• API is compatible with existing add-ons.
• Security precautions taken.

[AppVeyorBot]

• PASS: Translation comments check.
• PASS: Unit tests.
• PASS: Lint check.
• FAIL: System tests (tags: installer NVDA). See test results for more information.
• Build (for testing PR): https://ci.appveyor.com/api/buildjobs/enxt63jpvcx9g8vd/artifacts/output/nvda_snapshot_pr15527-29414,3a137076.exe
• CI timing (mins):
  INIT 0.0,
  INSTALL_START 0.9,
  INSTALL_END 1.0,
  BUILD_START 0.0,
  BUILD_END 24.8,
  TESTSETUP_START 0.0,
  TESTSETUP_END 0.3,
  TEST_START 0.0,
  TEST_END 22.5,
  FINISH_END 0.1

See test results for failed build of commit 3a137076ee