Topic Solved 2.1.0

• New translations: Estonian, Turkish
• Added colour picker for selection of text indicator colour.
• Excludes testing files from release package.
• Fixed several minor extension validation issues.
• Uses British English terms in default language instead of American English.
• Initial functional test added with supporting configuration.
• Fixed bug with ACP languages occasionally not loading.
• Added support for bb3-mobi style.
• Makes appropriate permission checks before locking topics.
• Unlocks topics when unsolving if "lock solved topics" is on.