Add unselectable Spanish spellcheck languages
Add unselectable Spanish spellcheck languages

Currently the user has to add and select generic Spanish to get
Spanish spellchecking. This change allows selecting individual
dialects in the hopes of increasing usage.

BUG=550812

Review-Url: https://codereview.chromium.org/1990013002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#394799}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk