Set TX_TOKEN for transifex client

I did some tests on my own fork, and we're writing to ~/.transifexrc but
the client can't seem to read that file. maybe issue with $HOME or
something.

Workaround is to set TX_TOKEN environment variable and now the pesky
~/.transifexrc file is not needed.

.github/workflows/ci.yml

@@ -19,11 +19,11 @@ jobs:
       - uses: actions/checkout@v3
         with:
           submodules: recursive
-          fetch-depth: 0   
+          fetch-depth: 0
       - name: Update Translation
         run: ./.ci/scripts/transifex/docker.sh
         env:
-          TRANSIFEX_API_TOKEN: ${{ secrets.TRANSIFEX_API_TOKEN }}
+          TX_TOKEN: ${{ secrets.TRANSIFEX_API_TOKEN }}
 
   reuse:
     runs-on: ubuntu-latest