Fixed title translation issue.

Closes #3159799

added 48 commits

• 02292f70...ccbeb57d - 47 commits from branch project:8.x-2.x
• 80b07a07 - Fixed title translation issue.

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added 1 commit

• efea32bb - Translate block_content source entities

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added 1 commit

• 2e373381 - Fix language column of block_content source entities

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resolved all threads

resolved all threads

added 1 commit

• e982d3b1 - Use property promotion

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added 1 commit

• 95259101 - Fix docblock

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