Added an option to Remove a new language description while uploading

[Ayan-10]

Description

Fixes #2810

What changes did you make and why?

Sometimes, a user might accidentally click the "+" button for adding a new language while uploading an image, there was no option to remove it in the current app. So I added a remove button so that the user can remove it.

Tests performed

Tested 3.0.0-lastest master on Pixel 4 with API level 27.

Screenshots

[nicolas-raoul]

It works great!
Just a javadoc request.
It reduces vertical space to view the picture when writing metadata, but I guess that's unavoidable.

[Ayan-10]

@nicolas-raoul I added java docs. Hope it's up to the mark now.

[codecov-commenter]

Codecov Report

Merging #4406 (e5532b6) into master (e9069d0) will increase coverage by 0.07%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #4406      +/-   ##
============================================
+ Coverage     10.30%   10.38%   +0.07%     
- Complexity      476      479       +3     
============================================
  Files           342      342              
  Lines         13114    13154      +40     
  Branches       1074     1074              
============================================
+ Hits           1352     1366      +14     
- Misses        11695    11719      +24     
- Partials         67       69       +2     

Impacted Files	Coverage Δ	Complexity Δ
...e/nrw/commons/upload/UploadMediaDetailAdapter.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...upload/mediaDetails/UploadMediaDetailFragment.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...fr/free/nrw/commons/category/ContinuationClient.kt	89.47% <0.00%> (-10.53%)	11.00% <0.00%> (ø%)
...mons/contributions/ContributionBoundaryCallback.kt	88.00% <0.00%> (-7.46%)	6.00% <0.00%> (ø%)
...main/java/fr/free/nrw/commons/media/MediaClient.kt	88.09% <0.00%> (-2.15%)	17.00% <0.00%> (ø%)
...mons/upload/mediaDetails/UploadMediaPresenter.java	54.28% <0.00%> (-1.60%)	15.00% <0.00%> (ø%)
...in/java/fr/free/nrw/commons/data/DBOpenHelper.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
...in/java/fr/free/nrw/commons/upload/UploadItem.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
...ava/fr/free/nrw/commons/review/ReviewActivity.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
...fr/free/nrw/commons/media/MediaDetailFragment.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
... and 1 more

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