Add i18n tags

[Alapan]

Closes #1278
Closes #1279
Closes #1280

[Alapan]

@brylie I added some of the tags. For autoforms, I am not sure how to add tags for the dropdown options, such as for the Send Feedback form.

[brylie]

@Alapan great work! To help us better track the translation process, please also reference the sub-tasks of #965 that this completes. You can see the sub-tasks that are linked to #965 by scrolling down in the comments section and looking for the 'open' label next to related issues.

[brylie]

We can merge this PR when all related issues have been linked. E.g. add multiple 'Closes #issue' to the PR description, each 'Closes' on its own line:

Closes #123
Closes #234
Closes #345
...

[jykae]

Is there some reason we are not using jquery 3.x ? Is something breaking?

[brylie]

At one point, we had to pin our jQuery version to less than 3, so that Bootstrap would work. Bootstrap < 3.3.7 did not support jQuery version 3.x. We are now using bootstrap 3.3.7, so can use jQuery 3.x.

bootstrap.js:15 Uncaught Error: Bootstrap's JavaScript requires jQuery version 1.9.1 or higher, but lower than version 3(anonymous function) @ bootstrap.js:15(anonymous function) @ bootstrap.js:17(anonymous function) @ twbs_bootstrap.js?hash=dc805bf…:2394(anonymous function) @ twbs_bootstrap.js?hash=dc805bf…:2401

See the following issue / PR:

• https://github.com/apinf/api-umbrella-dashboard/issues/1149
• https://github.com/apinf/api-umbrella-dashboard/pull/1150

[jykae]

@Alapan Reviewing.. Code looks good. I was just wondering one thing why we have limited jQuery to 2.x ? Is there something breaking when using 3.x ? But it is not blocking merging of this, if not sure.
I just run this after lunch, and see that everything functions nice.

[jykae]

@Alapan If interested to translate autoforms, we have this package in project, https://github.com/gwendall/meteor-autoform-i18n
It might provide some help for what you were wondering, if you look at the examples.

[jykae]

Well done.