Add step to install dependencies in i18n workflows

Author: silvanocerza

Diff for: .github/workflows/check-i18n-task.yml

@@ -31,5 +31,8 @@ jobs:
           node-version: '12.14.1'
           registry-url: 'https://registry.npmjs.org'
 
+      - name: Install dependencies
+        run: yarn
+
       - name: Check for errors
         run: yarn i18n:check

Diff for: .github/workflows/i18n-nightly-push.yml

@@ -18,6 +18,9 @@ jobs:
           node-version: '12.14.1'
           registry-url: 'https://registry.npmjs.org'
 
+      - name: Install dependencies
+        run: yarn
+
       - name: Run i18n:push script
         run: yarn run i18n:push
         env:

Diff for: .github/workflows/i18n-weekly-pull.yml

@@ -18,6 +18,9 @@ jobs:
           node-version: '12.14.1'
           registry-url: 'https://registry.npmjs.org'
 
+      - name: Install dependencies
+        run: yarn
+
       - name: Run i18n:pull script
         run: yarn run i18n:pull
         env: