Update translations and add more locale files for poll plugin

Files added:

```
new file:   plugins/poll/config/locales/client.ca.yml
new file:   plugins/poll/config/locales/client.fi.yml
new file:   plugins/poll/config/locales/client.he.yml
new file:   plugins/poll/config/locales/client.sq.yml
new file:   plugins/poll/config/locales/server.ca.yml
new file:   plugins/poll/config/locales/server.fi.yml
new file:   plugins/poll/config/locales/server.he.yml
new file:   plugins/poll/config/locales/server.sq.yml
```

cc @nlalonde