Hello there, did you find any solution for this problem. I am facing exactly the same and I am stuck!
Can find out how I am able to update the @angular/common and @angular/core.
Thank you!
Yes, if you are following instruction on ionic doc (https://ionicframework.com/docs/developer-resources/ng2-translate/), that is for angularJS ver 3.** and above. just install @ngx-translate/core --save and then install version@ngx-translate/http-loader@1.0.0 --save (i think) check your command line error it will tell what version to install.
The officially supported one is to use @ngx-translate/http-loader@0.1.0.
The other unsupported, may break things, do-at-your-own-risk option (which I have done without running into problems so far) is to update all your Angular dependencies to 4.3+. You will get peer dependency warnings. It should still work, and I like the new HttpClient API better than the old Http one.