Remove unused ID

Fixed several coding style errors.

Converted several fields to final and removed unused imports and colors.

Fixed SQL injection vulnerability (getodk#2281)

Update translations (getodk#2254)

Merge pull request getodk#2233 from lognaturel/update-translations

Update May translations

Fixed dropdown icon (getodk#2201)

Merge pull request getodk#2207 from lognaturel/jr-attempt

Exclude slf4j from javarosa import

Undo failed attempt at asynchronous FormDef cache saving (getodk#2166)

Synchronously write to the cache from FormLoaderTask.createFormDefFromCacheOrXml, as before. 

The attempt at asynchronous FormDef cache saving initialized the form before caching it, possibly resulting in one instance’s data being loaded into other instances. Affected users should reset the form load cache in the Admin Settings.

Attempts to make the asynchronous approach work were abandoned because FormDefs are mutable.

Use system toast colors and ToastUtils class in all cases (getodk#2117)

Starting in Android 8.1, Toasts have black text on a white background by default. Using system defaults ensures a consistent experience across applications and fixes an issue where toasts in 8.1 were showing up as white on white.

Upgrade Javarosa to 2.9.0 (getodk#2090)