Update cpptools-api to 4.0.1 in release branch for 0.28.3 (microsoft#……5624)

Update changelog. (microsoft#5539)

Update changelog. (microsoft#5539)

Localization - Translated Strings (microsoft#5472)Co-authored-by: DevDiv Build Lab - Dev14 <dlab14@microsoft.com>

Fix online vsix error message. (microsoft#5443)

Localization - Translated Strings (microsoft#5407)

check offline/insiders VSIX (microsoft#5341)* check offline/insiders VSIX* draft* add offline url, modify warning message* check offline/insiders VSIX* draft* add offline url, modify warning message* modify warning message* fix reviewers comments* changing the approach to determine the platform* fixing the integration test* testingCo-authored-by: Elaheh Rashedi <elrashed@microsoft.com>Co-authored-by: Bob Brown <bobbrow@users.noreply.github.com>

Disable Insiders updates for unsupported cases. (microsoft#5371)* Disable Insiders updates for unsupported cases.

Merge pull requestmicrosoft#5218 from microsoft/seanmcm/0_27_0_relea……se_merge2Seanmcm/0 27 0 release merge2

Update changelog. (microsoft#5206)