feat: improve translation check (#495)

**Summary**
This makes a few change to how we check for translations:
 - It splits this into a distinct workflow that is ran on a push to `main` (instead of checking for every pull request action)
 - It also adds a `workflow_dispatch` trigger such that we can manually run this check with any branch
 - It updates the output to only list the files that need to be updated for translations. See the two examples below

Example with no translations needed:
![Screenshot 2023-09-07 at 9 08 29 AM](https://github.com/sassoftware/vscode-sas-extension/assets/1058265/16041ef5-39d3-44a6-a059-0ab09abe8fac)

Example with translations needed: 
![Screenshot 2023-09-07 at 9 08 09 AM](https://github.com/sassoftware/vscode-sas-extension/assets/1058265/66b139fc-bcea-47e5-a370-be0d3599ea7d)

**Testing**
 - [x] Made sure github actions passed
 - [x] Temporarily added this branch to the translation check
 - [ ] Will test `workflow_dispatch` on main (workflow_dispatch triggers have to be in the default branch before they can be triggered via actions)

.github/workflows/pr.yml

@@ -19,14 +19,3 @@ jobs:
       - run: xvfb-run -a npm run test
         if: runner.os == 'Linux'
       - run: npx @vscode/vsce package
-  check-translations:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-node@v3
-        with:
-          node-version-file: ".nvmrc"
-          cache: "npm"
-      - run: npm ci
-      - run: npm run locale --update-locales
-      - run: git diff --exit-code

.github/workflows/translations.yml

@@ -0,0 +1,29 @@
+name: Translation Check
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+
+jobs:
+  check-translations:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version-file: ".nvmrc"
+          cache: "npm"
+      - run: npm ci
+      - run: npm run locale --update-locales
+      - run: |
+          CHANGES=$(git diff --name-only)
+          if [ -z "$CHANGES" ]
+          then
+            echo "No translations needed"
+          else
+            echo "The following files need translations:"
+            echo $CHANGES
+            exit 1
+          fi